General
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Target
99862073a5f3df00516a49e3b78057b1
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Size
635KB
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Sample
240213-qlkhdsca79
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MD5
99862073a5f3df00516a49e3b78057b1
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SHA1
46ac6d3ec2cb7d90d946a1470b5dff98eecee011
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SHA256
bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2
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SHA512
d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629
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SSDEEP
12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK
Static task
static1
Behavioral task
behavioral1
Sample
99862073a5f3df00516a49e3b78057b1.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
99862073a5f3df00516a49e3b78057b1.exe
Resource
win10v2004-20231222-en
Malware Config
Extracted
quasar
2.1.0.0
Windows firewall
23.105.131.187:7812
VNM_MUTEX_zGeT5SjdI1pYgFyiav
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encryption_key
3kpwI2tkVNrXY2Mm5wlR
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install_name
Windows Security.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Windows Update
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subdirectory
Windows Firewall Updates
Targets
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Target
99862073a5f3df00516a49e3b78057b1
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Size
635KB
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MD5
99862073a5f3df00516a49e3b78057b1
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SHA1
46ac6d3ec2cb7d90d946a1470b5dff98eecee011
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SHA256
bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2
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SHA512
d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629
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SSDEEP
12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK
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Contains code to disable Windows Defender
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
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Quasar payload
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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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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
1Create or Modify System Process
1Windows Service
1Scheduled Task/Job
1