Analysis
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max time kernel
150s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20221111-en -
resource tags
arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system -
submitted
02-02-2023 10:50
Behavioral task
behavioral1
Sample
tmp.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
tmp.exe
Resource
win10v2004-20221111-en
General
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Target
tmp.exe
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Size
6KB
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MD5
48a13c217c965ed66e5d6c018b89217b
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SHA1
2d8b62d02c73e7e2fc367fc64b51350564c7acb4
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SHA256
8650dcaece1489d98b7f6782ae638de33797f2a1018f949ec270054f0893aea0
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SHA512
b0e5556ad36a74ddfbbbfcd94f04635a614bc70d159aaab8fb540ecd0d823e14c2ed8687b95943cd992b434c37c9bfaa04db79c62f9d654b85616f45d275802a
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SSDEEP
96:4rs7rOMGPGDupbGL7g8y23I6mUUWH78kVl6l2xzNt:oKrsPGDupKL7nNhVlk2T
Malware Config
Extracted
purecrypter
https://onedrive.live.com/download?cid=A113DD34A0D77810&resid=A113DD34A0D77810%21121&authkey=APUVM8ZXD6Jpjd0
Extracted
remcos
RemoteHost
top.thekillforabuse1.xyz:1068
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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
remcos.exe
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copy_folder
Remcos
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delete_file
false
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hide_file
false
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hide_keylog_file
false
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install_flag
false
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keylog_crypt
false
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keylog_file
logs.dat
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keylog_flag
false
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keylog_folder
remcos
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mouse_option
false
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mutex
Rmc-R762FE
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screenshot_crypt
false
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screenshot_flag
false
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screenshot_folder
Screenshots
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screenshot_path
%AppData%
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screenshot_time
10
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startup_value
Remcos
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take_screenshot_option
false
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take_screenshot_time
5
Signatures
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PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
tmp.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation tmp.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
tmp.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Tqgxduxq = "\"C:\\Users\\Admin\\AppData\\Roaming\\Fnslyd\\Tqgxduxq.exe\"" tmp.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
tmp.exedescription pid process target process PID 4800 set thread context of 2672 4800 tmp.exe tmp.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 2 IoCs
Processes:
powershell.exepid process 2444 powershell.exe 2444 powershell.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
tmp.exepowershell.exedescription pid process Token: SeDebugPrivilege 4800 tmp.exe Token: SeDebugPrivilege 2444 powershell.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
tmp.exedescription pid process target process PID 4800 wrote to memory of 2444 4800 tmp.exe powershell.exe PID 4800 wrote to memory of 2444 4800 tmp.exe powershell.exe PID 4800 wrote to memory of 2444 4800 tmp.exe powershell.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe PID 4800 wrote to memory of 2672 4800 tmp.exe tmp.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\tmp.exe"C:\Users\Admin\AppData\Local\Temp\tmp.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\tmp.exeC:\Users\Admin\AppData\Local\Temp\tmp.exe2⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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memory/2444-140-0x0000000007510000-0x0000000007B8A000-memory.dmpFilesize
6.5MB
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memory/2444-136-0x0000000004E60000-0x0000000005488000-memory.dmpFilesize
6.2MB
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memory/2444-134-0x0000000000000000-mapping.dmp
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memory/2444-135-0x00000000023A0000-0x00000000023D6000-memory.dmpFilesize
216KB
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memory/2444-139-0x0000000005C90000-0x0000000005CAE000-memory.dmpFilesize
120KB
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memory/2444-137-0x0000000005590000-0x00000000055F6000-memory.dmpFilesize
408KB
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memory/2444-141-0x0000000006180000-0x000000000619A000-memory.dmpFilesize
104KB
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memory/2444-138-0x0000000005600000-0x0000000005666000-memory.dmpFilesize
408KB
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memory/2672-142-0x0000000000000000-mapping.dmp
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memory/2672-143-0x0000000000400000-0x000000000047F000-memory.dmpFilesize
508KB
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memory/2672-144-0x0000000000400000-0x000000000047F000-memory.dmpFilesize
508KB
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memory/2672-145-0x0000000000400000-0x000000000047F000-memory.dmpFilesize
508KB
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memory/2672-146-0x0000000000400000-0x000000000047F000-memory.dmpFilesize
508KB
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memory/2672-147-0x0000000000400000-0x000000000047F000-memory.dmpFilesize
508KB
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memory/4800-133-0x0000000007480000-0x00000000074A2000-memory.dmpFilesize
136KB
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memory/4800-132-0x0000000000150000-0x0000000000158000-memory.dmpFilesize
32KB