General
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Target
remcos_a.exe
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Size
469KB
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Sample
240917-z31elsvepg
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MD5
48f4a8f633bf5535811c23a81d8d8506
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SHA1
c2a98525bfda82421cb8670db223b19acef31f23
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SHA256
9ec9c4c81c67d6628d141981a7020bb7ded83b4c40ff693870cd98eaebf74912
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SHA512
7903c322d886bcffc06a9310ba451b0f0eac53d2acedf45b544548ae3656ef477b5a03a86d54452d65461957df4c643082338119bdeb0f2303f528daf0642e29
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SSDEEP
12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSOn9:uiLJbpI7I2WhQqZ7O9
Malware Config
Extracted
remcos
RemoteHost
192.168.1.56:13970
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audio_folder
MicRecords
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audio_record_time
5
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connect_delay
0
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connect_interval
1
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copy_file
Windows32.exe
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copy_folder
Health
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delete_file
true
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hide_file
true
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hide_keylog_file
true
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install_flag
true
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install_path
%WinDir%\System32
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keylog_crypt
true
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keylog_file
logs.dat
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keylog_flag
false
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keylog_folder
filer32
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keylog_path
%WinDir%\System32
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mouse_option
false
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mutex
Rmc-36XJ31
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screenshot_crypt
true
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screenshot_flag
true
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screenshot_folder
Screenshots
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screenshot_path
%WinDir%\System32
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screenshot_time
10
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startup_value
WindowsHealth
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take_screenshot_option
false
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take_screenshot_time
5
Targets
-
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Target
remcos_a.exe
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Size
469KB
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MD5
48f4a8f633bf5535811c23a81d8d8506
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SHA1
c2a98525bfda82421cb8670db223b19acef31f23
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SHA256
9ec9c4c81c67d6628d141981a7020bb7ded83b4c40ff693870cd98eaebf74912
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SHA512
7903c322d886bcffc06a9310ba451b0f0eac53d2acedf45b544548ae3656ef477b5a03a86d54452d65461957df4c643082338119bdeb0f2303f528daf0642e29
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SSDEEP
12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSOn9:uiLJbpI7I2WhQqZ7O9
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Adds policy Run key to start application
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Manipulates Digital Signatures
Attackers can apply techniques such as modifying certain DLL exports to make their binary seem valid.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Deletes itself
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Executes dropped EXE
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Adds Run key to start application
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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
Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Hide Artifacts
1Hidden Files and Directories
1Impair Defenses
1Disable or Modify Tools
1Modify Registry
4