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Linux Analysis Report
crossc2.elf

Overview

General Information

Sample name:crossc2.elf
Analysis ID:1675441
MD5:c3bf60ed4f1b0d323fa522d24a7c4b71
SHA1:8126411d80b4a382c47f3778e492a18dbfc45a7e
SHA256:eb330d6449af1c48cad0064489bb28a2042e3b605e93e037c6853a336296d0fa
Tags:elfHUNuser-smica83
Infos:

Detection

Score:52
Range:0 - 100

Signatures

Multi AV Scanner detection for submitted file
Sample is packed with UPX
ELF contains segments with high entropy indicating compressed/encrypted content
Executes the "rm" command used to delete files or directories
Sample contains only a LOAD segment without any section mappings
Sleeps for long times indicative of sandbox evasion
Uses the "uname" system call to query kernel version information (possible evasion)

Classification

RansomwareSpreadingPhishingBankerTrojan / BotAdwareSpywareExploiterEvaderMinercleansuspiciousmalicious
Joe Sandbox version:42.0.0 Malachite
Analysis ID:1675441
Start date and time:2025-04-27 12:09:24 +02:00
Joe Sandbox product:CloudBasic
Overall analysis duration:0h 5m 0s
Hypervisor based Inspection enabled:false
Report type:full
Cookbook file name:defaultlinuxfilecookbook.jbs
Analysis system description:Ubuntu Linux 20.04 x64 (Kernel 5.4.0-72, Firefox 91.0, Evince Document Viewer 3.36.10, LibreOffice 6.4.7.2, OpenJDK 11.0.11)
Analysis Mode:default
Sample name:crossc2.elf
Detection:MAL
Classification:mal52.evad.linELF@0/0@0/0
Command:/tmp/crossc2.elf
PID:6232
Exit Code:0
Exit Code Info:
Killed:False
Standard Output:

Standard Error:
  • system is lnxubuntu20
  • crossc2.elf (PID: 6232, Parent: 6156, MD5: c3bf60ed4f1b0d323fa522d24a7c4b71) Arguments: /tmp/crossc2.elf
  • dash New Fork (PID: 6292, Parent: 4336)
  • rm (PID: 6292, Parent: 4336, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdb
  • dash New Fork (PID: 6293, Parent: 4336)
  • rm (PID: 6293, Parent: 4336, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdb
  • cleanup
No yara matches
No Suricata rule has matched

Click to jump to signature section

Show All Signature Results

AV Detection

barindex
Source: crossc2.elfVirustotal: Detection: 29%Perma Link
Source: crossc2.elfReversingLabs: Detection: 55%
Source: unknownTCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknownTCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknownTCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknownTCP traffic detected without corresponding DNS query: 34.249.145.219
Source: unknownTCP traffic detected without corresponding DNS query: 34.249.145.219
Source: unknownTCP traffic detected without corresponding DNS query: 34.249.145.219
Source: unknownTCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknownTCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknownTCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknownTCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknownTCP traffic detected without corresponding DNS query: 34.249.145.219
Source: crossc2.elfString found in binary or memory: http://upx.sf.net
Source: crossc2.elf, 6232.1.0000000000400000.000000000078d000.r-x.sdmpString found in binary or memory: http://www.openssl.org/support/faq.html
Source: crossc2.elf, 6232.1.0000000000400000.000000000078d000.r-x.sdmpString found in binary or memory: http://www.openssl.org/support/faq.htmlRAND
Source: unknownNetwork traffic detected: HTTP traffic on port 443 -> 51426
Source: unknownNetwork traffic detected: HTTP traffic on port 443 -> 39250
Source: unknownNetwork traffic detected: HTTP traffic on port 43928 -> 443
Source: unknownNetwork traffic detected: HTTP traffic on port 443 -> 51424
Source: unknownNetwork traffic detected: HTTP traffic on port 51426 -> 443
Source: unknownNetwork traffic detected: HTTP traffic on port 42836 -> 443
Source: unknownNetwork traffic detected: HTTP traffic on port 51424 -> 443
Source: unknownNetwork traffic detected: HTTP traffic on port 39250 -> 443
Source: LOAD without section mappingsProgram segment: 0x400000
Source: classification engineClassification label: mal52.evad.linELF@0/0@0/0

Data Obfuscation

barindex
Source: initial sampleString containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sampleString containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sampleString containing UPX found: $Id: UPX 3.94 Copyright (C) 1996-2017 the UPX Team. All Rights Reserved. $
Source: /usr/bin/dash (PID: 6292)Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdbJump to behavior
Source: /usr/bin/dash (PID: 6293)Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdbJump to behavior
Source: crossc2.elfSubmission file: segment LOAD with 7.9135 entropy (max. 8.0)
Source: /tmp/crossc2.elf (PID: 6233)Sleeps longer then 60s: 240.0sJump to behavior
Source: /tmp/crossc2.elf (PID: 6232)Queries kernel information via 'uname': Jump to behavior
Source: /tmp/crossc2.elf (PID: 6233)Queries kernel information via 'uname': Jump to behavior
ReconnaissanceResource DevelopmentInitial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact
Gather Victim Identity InformationAcquire InfrastructureValid AccountsWindows Management InstrumentationPath InterceptionPath Interception1
Virtualization/Sandbox Evasion
OS Credential Dumping1
Security Software Discovery
Remote ServicesData from Local System1
Encrypted Channel
Exfiltration Over Other Network MediumAbuse Accessibility Features
CredentialsDomainsDefault AccountsScheduled Task/JobBoot or Logon Initialization ScriptsBoot or Logon Initialization Scripts11
Obfuscated Files or Information
LSASS Memory1
Virtualization/Sandbox Evasion
Remote Desktop ProtocolData from Removable Media1
Application Layer Protocol
Exfiltration Over BluetoothNetwork Denial of Service
Email AddressesDNS ServerDomain AccountsAtLogon Script (Windows)Logon Script (Windows)1
File Deletion
Security Account ManagerQuery RegistrySMB/Windows Admin SharesData from Network Shared DriveSteganographyAutomated ExfiltrationData Encrypted for Impact
No configs have been found
Hide Legend

Legend:

  • Process
  • Signature
  • Created File
  • DNS/IP Info
  • Is Dropped
  • Number of created Files
  • Is malicious
  • Internet
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1675441 Sample: crossc2.elf Startdate: 27/04/2025 Architecture: LINUX Score: 52 15 109.202.202.202, 80 INIT7CH Switzerland 2->15 17 91.189.91.42, 443 CANONICAL-ASGB United Kingdom 2->17 19 2 other IPs or domains 2->19 21 Multi AV Scanner detection for submitted file 2->21 23 Sample is packed with UPX 2->23 7 crossc2.elf 2->7         started        9 dash rm 2->9         started        11 dash rm 2->11         started        signatures3 process4 process5 13 crossc2.elf 7->13         started       
SourceDetectionScannerLabelLink
crossc2.elf30%VirustotalBrowse
crossc2.elf56%ReversingLabsLinux.Trojan.CobalStrike
No Antivirus matches
No Antivirus matches
No Antivirus matches

Download Network PCAP: filteredfull

No contacted domains info
NameSourceMaliciousAntivirus DetectionReputation
http://upx.sf.netcrossc2.elffalse
    high
    http://www.openssl.org/support/faq.htmlRANDcrossc2.elf, 6232.1.0000000000400000.000000000078d000.r-x.sdmpfalse
      high
      http://www.openssl.org/support/faq.htmlcrossc2.elf, 6232.1.0000000000400000.000000000078d000.r-x.sdmpfalse
        high
        • No. of IPs < 25%
        • 25% < No. of IPs < 50%
        • 50% < No. of IPs < 75%
        • 75% < No. of IPs
        IPDomainCountryFlagASNASN NameMalicious
        34.249.145.219
        unknownUnited States
        16509AMAZON-02USfalse
        109.202.202.202
        unknownSwitzerland
        13030INIT7CHfalse
        91.189.91.43
        unknownUnited Kingdom
        41231CANONICAL-ASGBfalse
        91.189.91.42
        unknownUnited Kingdom
        41231CANONICAL-ASGBfalse
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                                                                    No context
                                                                    No context
                                                                    No created / dropped files found
                                                                    File type:ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, no section header
                                                                    Entropy (8bit):7.91350482781896
                                                                    TrID:
                                                                    • ELF Executable and Linkable format (generic) (4004/1) 100.00%
                                                                    File name:crossc2.elf
                                                                    File size:1'425'368 bytes
                                                                    MD5:c3bf60ed4f1b0d323fa522d24a7c4b71
                                                                    SHA1:8126411d80b4a382c47f3778e492a18dbfc45a7e
                                                                    SHA256:eb330d6449af1c48cad0064489bb28a2042e3b605e93e037c6853a336296d0fa
                                                                    SHA512:7643340ee8f33114cf4ff69b5bd61bb439f1b8f57eaac410f0feefb5275f17fb6a25fdf64579ab0a3df31dab721c79e67ba4b6c8c6b87e4c9f902ae2452a68f9
                                                                    SSDEEP:24576:nAHgTVEYTG8g9dnGU3XNqW+E8C73G+xY3/My4c763Gheij87uptkuLpIXEfsxV:n2E5g9hbXUjHQ3G33Uy4+zj87rcpIXE+
                                                                    TLSH:656523D600901AA39115283BA46A7FF13F212D6B2B3238582D96EEC7CFB90E54D597DC
                                                                    File Content Preview:.ELF..............>.......U.....@...................@.8...@.......................@.......@....................... ......................7.......7..............................Q.td....................................................1..gUPX!8.......H.:.H.:

                                                                    ELF header

                                                                    Class:ELF64
                                                                    Data:2's complement, little endian
                                                                    Version:1 (current)
                                                                    Machine:Advanced Micro Devices X86-64
                                                                    Version Number:0x1
                                                                    Type:EXEC (Executable file)
                                                                    OS/ABI:UNIX - System V
                                                                    ABI Version:0
                                                                    Entry Point Address:0x55b3c8
                                                                    Flags:0x0
                                                                    ELF Header Size:64
                                                                    Program Header Offset:64
                                                                    Program Header Size:56
                                                                    Number of Program Headers:3
                                                                    Section Header Offset:0
                                                                    Section Header Size:64
                                                                    Number of Section Headers:0
                                                                    Header String Table Index:0
                                                                    TypeOffsetVirtual AddressPhysical AddressFile SizeMemory SizeEntropyFlagsFlags DescriptionAlignProg InterpreterSection Mappings
                                                                    LOAD0x00x4000000x4000000x15bbf30x15bbf37.91350x5R E0x200000
                                                                    LOAD0x7b00x9a37b00x9a37b00x00x00.00000x6RW 0x1000
                                                                    GNU_STACK0x00x00x00x00x00.00000x7RWE0x10

                                                                    Download Network PCAP: filteredfull

                                                                    • Total Packets: 11
                                                                    • 443 (HTTPS)
                                                                    • 80 (HTTP)
                                                                    TimestampSource PortDest PortSource IPDest IP
                                                                    Apr 27, 2025 12:10:08.115572929 CEST51424443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.115618944 CEST44351424192.168.238.133192.168.2.23
                                                                    Apr 27, 2025 12:10:08.115706921 CEST51424443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.116058111 CEST51424443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.116097927 CEST44351424192.168.238.133192.168.2.23
                                                                    Apr 27, 2025 12:10:08.116139889 CEST51424443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.116990089 CEST51426443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.117027044 CEST44351426192.168.238.133192.168.2.23
                                                                    Apr 27, 2025 12:10:08.117068052 CEST51426443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.117968082 CEST51426443192.168.2.23192.168.238.133
                                                                    Apr 27, 2025 12:10:08.117984056 CEST44351426192.168.238.133192.168.2.23
                                                                    Apr 27, 2025 12:10:10.201441050 CEST43928443192.168.2.2391.189.91.42
                                                                    Apr 27, 2025 12:10:15.832678080 CEST42836443192.168.2.2391.189.91.43
                                                                    Apr 27, 2025 12:10:17.368534088 CEST4251680192.168.2.23109.202.202.202
                                                                    Apr 27, 2025 12:10:30.944233894 CEST39250443192.168.2.2334.249.145.219
                                                                    Apr 27, 2025 12:10:30.944277048 CEST4433925034.249.145.219192.168.2.23
                                                                    Apr 27, 2025 12:10:30.944423914 CEST39250443192.168.2.2334.249.145.219
                                                                    Apr 27, 2025 12:10:30.944592953 CEST39250443192.168.2.2334.249.145.219
                                                                    Apr 27, 2025 12:10:30.944608927 CEST4433925034.249.145.219192.168.2.23
                                                                    Apr 27, 2025 12:10:31.958550930 CEST43928443192.168.2.2391.189.91.42
                                                                    Apr 27, 2025 12:10:42.197088957 CEST42836443192.168.2.2391.189.91.43
                                                                    Apr 27, 2025 12:10:48.340287924 CEST4251680192.168.2.23109.202.202.202
                                                                    Apr 27, 2025 12:11:12.912903070 CEST43928443192.168.2.2391.189.91.42
                                                                    Apr 27, 2025 12:11:30.936466932 CEST39250443192.168.2.2334.249.145.219
                                                                    Apr 27, 2025 12:11:30.984280109 CEST4433925034.249.145.219192.168.2.23
                                                                    Apr 27, 2025 12:12:19.136497021 CEST44351426192.168.238.133192.168.2.23

                                                                    System Behavior

                                                                    Start time (UTC):10:10:06
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/tmp/crossc2.elf
                                                                    Arguments:/tmp/crossc2.elf
                                                                    File size:1425368 bytes
                                                                    MD5 hash:c3bf60ed4f1b0d323fa522d24a7c4b71

                                                                    Start time (UTC):10:10:07
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/tmp/crossc2.elf
                                                                    Arguments:-
                                                                    File size:1425368 bytes
                                                                    MD5 hash:c3bf60ed4f1b0d323fa522d24a7c4b71

                                                                    Start time (UTC):10:11:30
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/usr/bin/dash
                                                                    Arguments:-
                                                                    File size:129816 bytes
                                                                    MD5 hash:1e6b1c887c59a315edb7eb9a315fc84c

                                                                    Start time (UTC):10:11:30
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/usr/bin/rm
                                                                    Arguments:rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdb
                                                                    File size:72056 bytes
                                                                    MD5 hash:aa2b5496fdbfd88e38791ab81f90b95b

                                                                    Start time (UTC):10:11:30
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/usr/bin/dash
                                                                    Arguments:-
                                                                    File size:129816 bytes
                                                                    MD5 hash:1e6b1c887c59a315edb7eb9a315fc84c

                                                                    Start time (UTC):10:11:30
                                                                    Start date (UTC):27/04/2025
                                                                    Path:/usr/bin/rm
                                                                    Arguments:rm -f /tmp/tmp.bnI3rvlK06 /tmp/tmp.9xg2aFJEmC /tmp/tmp.eJOr5MtPdb
                                                                    File size:72056 bytes
                                                                    MD5 hash:aa2b5496fdbfd88e38791ab81f90b95b