General
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Target
PolyBuilds_1v1.exe
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Size
7KB
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Sample
241230-q9rllsyrgv
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MD5
457734c0807c0ea1ec9496ee463f7601
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SHA1
ce5202753b348d974c369ec7bded652ffb778f57
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SHA256
ad4cf56d16c8f2167af4d5c09762741a325bfcb9410799d1cf7d94c16858448a
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SHA512
104f520f47a24add7300e5892a4c770da80dbbac9b2162b07dca4c8916ca17e12d93649bcb8f24e04f29d0659aa025b4b6d35ccc070446ad38b825ae01228015
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SSDEEP
96:bvAIxE61JOML7eR8zH7lRPOlkjDt/MNnoYbiMD7pV3k1Rf+p6G:E2b1Jh3zblhOwVMrpV3kDf+
Static task
static1
Behavioral task
behavioral1
Sample
PolyBuilds_1v1.exe
Resource
win7-20240729-en
Behavioral task
behavioral2
Sample
PolyBuilds_1v1.exe
Resource
win10v2004-20241007-en
Malware Config
Extracted
xworm
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Install_directory
%AppData%
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install_file
RtkAudUService64.exe
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pastebin_url
https://pastebin.com/raw/6ZBHT1SN
Targets
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Target
PolyBuilds_1v1.exe
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Size
7KB
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MD5
457734c0807c0ea1ec9496ee463f7601
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SHA1
ce5202753b348d974c369ec7bded652ffb778f57
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SHA256
ad4cf56d16c8f2167af4d5c09762741a325bfcb9410799d1cf7d94c16858448a
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SHA512
104f520f47a24add7300e5892a4c770da80dbbac9b2162b07dca4c8916ca17e12d93649bcb8f24e04f29d0659aa025b4b6d35ccc070446ad38b825ae01228015
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SSDEEP
96:bvAIxE61JOML7eR8zH7lRPOlkjDt/MNnoYbiMD7pV3k1Rf+p6G:E2b1Jh3zblhOwVMrpV3kDf+
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Detect Xworm Payload
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Suspicious use of NtCreateUserProcessOtherParentProcess
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Xworm family
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Downloads MZ/PE file
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Sets service image path in registry
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Indicator Removal: Clear Windows Event Logs
Clear Windows Event Logs to hide the activity of an intrusion.
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Enumerates connected drives
Attempts to read the root path of hard drives other than the default C: drive.
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Legitimate hosting services abused for malware hosting/C2
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Looks up external IP address via web service
Uses a legitimate IP lookup service to find the infected system's external IP.
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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Drops file in System32 directory
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Suspicious use of SetThreadContext
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MITRE ATT&CK Enterprise v15
Execution
Command and Scripting Interpreter
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Pre-OS Boot
1Bootkit
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Defense Evasion
Indicator Removal
1Clear Windows Event Logs
1Modify Registry
1Pre-OS Boot
1Bootkit
1