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Windows
Analysis Report
New PO [FK4-7173].pdf.exe
Overview
General Information
Detection
FormBook
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Sigma detected: Suspicious Double Extension File Execution
Yara detected AntiVM3
Yara detected FormBook
.NET source code contains potential unpacker
.NET source code contains very large array initializations
AI detected suspicious sample
Adds a directory exclusion to Windows Defender
Found direct / indirect Syscall (likely to bypass EDR)
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Loading BitLocker PowerShell Module
Machine Learning detection for sample
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Switches to a custom stack to bypass stack traces
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses an obfuscated file name to hide its real file extension (double extension)
Uses shutdown.exe to shutdown or reboot the system
Allocates memory with a write watch (potentially for evading sandboxes)
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to read the PEB
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Sigma detected: Powershell Defender Exclusion
Suricata IDS alerts with low severity for network traffic
Uses 32bit PE files
Uses code obfuscation techniques (call, push, ret)
Classification
- System is w10x64
- New PO [FK4-7173].pdf.exe (PID: 5592 cmdline:
"C:\Users\ user\Deskt op\New PO [FK4-7173] .pdf.exe" MD5: F946F99DF4C8406BA19B70561C1D53F6) - powershell.exe (PID: 6564 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" Add-MpPref erence -Ex clusionPat h "C:\User s\user\Des ktop\New P O [FK4-717 3].pdf.exe " MD5: C32CA4ACFCC635EC1EA6ED8A34DF5FAC) - conhost.exe (PID: 1396 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - New PO [FK4-7173].pdf.exe (PID: 5316 cmdline:
"C:\Users\ user\Deskt op\New PO [FK4-7173] .pdf.exe" MD5: F946F99DF4C8406BA19B70561C1D53F6) - MKVNVRSuoK.exe (PID: 1568 cmdline:
"C:\Progra m Files (x 86)\rBqzZz zHcmwzxiop DSMsktNKny KFJzhHHmut zYqlidQUGb RoAWJSJLqn MwXwwzM\MK VNVRSuoK.e xe" MD5: 32B8AD6ECA9094891E792631BAEA9717) - shutdown.exe (PID: 5332 cmdline:
"C:\Window s\SysWOW64 \shutdown. exe" MD5: FCDE5AF99B82AE6137FB90C7571D40C3) - MKVNVRSuoK.exe (PID: 3660 cmdline:
"C:\Progra m Files (x 86)\rBqzZz zHcmwzxiop DSMsktNKny KFJzhHHmut zYqlidQUGb RoAWJSJLqn MwXwwzM\MK VNVRSuoK.e xe" MD5: 32B8AD6ECA9094891E792631BAEA9717) - firefox.exe (PID: 5748 cmdline:
"C:\Progra m Files\Mo zilla Fire fox\Firefo x.exe" MD5: C86B1BE9ED6496FE0E0CBE73F81D8045)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
⊘No configs have been found
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Click to see the 4 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security |
System Summary |
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Source: | Author: Florian Roth (Nextron Systems), @blu3_team (idea), Nasreddine Bencherchali (Nextron Systems): |
Source: | Author: Florian Roth (Nextron Systems): |
Source: | Author: Florian Roth (Nextron Systems): |
Source: | Author: Roberto Rodriguez @Cyb3rWard0g (rule), oscd.community (improvements): |
Timestamp | SID | Severity | Classtype | Source IP | Source Port | Destination IP | Destination Port | Protocol |
---|---|---|---|---|---|---|---|---|
2024-11-09T05:35:14.821461+0100 | 2022930 | 1 | A Network Trojan was detected | 20.12.23.50 | 443 | 192.168.2.5 | 49709 | TCP |
2024-11-09T05:35:53.868488+0100 | 2022930 | 1 | A Network Trojan was detected | 20.12.23.50 | 443 | 192.168.2.5 | 49910 | TCP |
Click to jump to signature section
Show All Signature Results
AV Detection |
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Source: | Virustotal: | Perma Link |
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Source: | Code function: | 7_2_026DC700 |
Source: | Code function: | 0_2_0513A5C4 | |
Source: | Code function: | 0_2_0513A9E5 | |
Source: | Code function: | 7_2_026C9E20 | |
Source: | Code function: | 7_2_026CE336 | |
Source: | Code function: | 7_2_02DD04E8 |
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