General
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Target
PolyBuilds_1v1.exe
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Size
7KB
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Sample
241230-rlpb1sxjfm
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MD5
2fae942335ec0270cbe0e8496fe5bdfd
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SHA1
b80444b8f5cb7bd4722b45fe15438762df20b443
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SHA256
c2da68ac7342ec39b1a6fd5c5688a81d6cf40cee65ab1653c72cdc6d302fa51c
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SHA512
3b2a01d380940c07030292aca7ac0ca38980e8cd58bdb255f853b6a84309c11beb6ef16249bf96beee039cfa888b5b62963bb2b507019041f17c067b63d4d6a2
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SSDEEP
96:TJWv2mqCKMrvJSA/Z7YR8mH7sRPOlkjDt/MpmPBoYbiMvZpV3Q1Rf+p6G:Ty2MjJ9HmbshOwVYyr/3V3QDf+
Static task
static1
Behavioral task
behavioral1
Sample
PolyBuilds_1v1.exe
Resource
win7-20240903-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
2fae942335ec0270cbe0e8496fe5bdfd
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SHA1
b80444b8f5cb7bd4722b45fe15438762df20b443
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SHA256
c2da68ac7342ec39b1a6fd5c5688a81d6cf40cee65ab1653c72cdc6d302fa51c
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SHA512
3b2a01d380940c07030292aca7ac0ca38980e8cd58bdb255f853b6a84309c11beb6ef16249bf96beee039cfa888b5b62963bb2b507019041f17c067b63d4d6a2
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SSDEEP
96:TJWv2mqCKMrvJSA/Z7YR8mH7sRPOlkjDt/MpmPBoYbiMvZpV3Q1Rf+p6G:Ty2MjJ9HmbshOwVYyr/3V3QDf+
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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