General
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Target
$77-Loader.exe
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Size
269KB
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Sample
240527-ak9g5ahc9s
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MD5
1e5dca7624bede5defb3006616566321
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SHA1
cebd46b0517f0081238f22f848bb1c98e88a7d29
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SHA256
ad154938cd996370a456640152ef662faf363af1382bce7c31ece36a1d77a2ec
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SHA512
2aaa992f1dececb7a9f1f56c120470a33317370e0897229425b3fdd9a1a3f46639b31481d6fdf784c99874a05e1cb1dbf99db089e8affdb6daa553d5f279bc0c
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SSDEEP
6144:4kGh0ZB3HzbQ+1GCs2K3w1M999YVz62r3S2k:4kLRl1GCsJ2M322
Static task
static1
Behavioral task
behavioral1
Sample
$77-Loader.exe
Resource
win10-20240404-en
Behavioral task
behavioral2
Sample
$77-Loader.exe
Resource
win10v2004-20240508-en
Behavioral task
behavioral3
Sample
$77-Loader.exe
Resource
win11-20240426-en
Malware Config
Extracted
xworm
uk2.localto.net:9979
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Install_directory
%Userprofile%
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install_file
$77-Powershell.exe
Targets
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Target
$77-Loader.exe
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Size
269KB
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MD5
1e5dca7624bede5defb3006616566321
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SHA1
cebd46b0517f0081238f22f848bb1c98e88a7d29
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SHA256
ad154938cd996370a456640152ef662faf363af1382bce7c31ece36a1d77a2ec
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SHA512
2aaa992f1dececb7a9f1f56c120470a33317370e0897229425b3fdd9a1a3f46639b31481d6fdf784c99874a05e1cb1dbf99db089e8affdb6daa553d5f279bc0c
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SSDEEP
6144:4kGh0ZB3HzbQ+1GCs2K3w1M999YVz62r3S2k:4kLRl1GCsJ2M322
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Detect Xworm Payload
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Suspicious use of NtCreateUserProcessOtherParentProcess
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Command and Scripting Interpreter: PowerShell
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
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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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Drops startup file
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Executes dropped EXE
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Adds Run key to start application
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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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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
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Pre-OS Boot
1Bootkit
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Scheduled Task/Job
1