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General
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Target
buildz.exe
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Size
728KB
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Sample
240327-y9g16sbd86
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MD5
1ac225bc36c31f9209f984210bd68469
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SHA1
b43db3c1f19bca6b35e91ee88edf8c80d4e6c422
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SHA256
d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc
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SHA512
e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3
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SSDEEP
12288:yCLwobUsKbD6axHJhie99gldRoo+uoagdWip+KSN7uO7/:yYsmaZJwAglLoo+5WioKSN7ue/
Static task
static1
Behavioral task
behavioral1
Sample
buildz.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
buildz.exe
Resource
win10-20240221-en
Behavioral task
behavioral3
Sample
buildz.exe
Resource
win10v2004-20231215-en
Behavioral task
behavioral4
Sample
buildz.exe
Resource
win11-20240221-en
Malware Config
Extracted
djvu
http://sajdfue.com/test1/get.php
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extension
.vook
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offline_id
1eSPzWRaNslCgtjBZfL5pzvovoiaVI4IZSnvAwt1
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payload_url
http://sdfjhuz.com/dl/build2.exe
http://sajdfue.com/files/1/build3.exe
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ransomnote
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Extracted
vidar
8.6
5739ef2bbcd39fcd59c5746bfe4238c5
https://steamcommunity.com/profiles/76561199658817715
https://t.me/sa9ok
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profile_id_v2
5739ef2bbcd39fcd59c5746bfe4238c5
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user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Targets
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Target
buildz.exe
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Size
728KB
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MD5
1ac225bc36c31f9209f984210bd68469
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SHA1
b43db3c1f19bca6b35e91ee88edf8c80d4e6c422
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SHA256
d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc
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SHA512
e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3
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SSDEEP
12288:yCLwobUsKbD6axHJhie99gldRoo+uoagdWip+KSN7uO7/:yYsmaZJwAglLoo+5WioKSN7ue/
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Detect Vidar Stealer
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Detected Djvu ransomware
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Downloads MZ/PE file
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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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Loads dropped DLL
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Modifies file permissions
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Adds Run key to start application
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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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Suspicious use of SetThreadContext
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1