Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
11/05/2024, 02:09
General
- Target TAX ORGANIZER 2023/Sandra 2023 Tax Organizer.exe
- Size 31KB
- Sample240511-clep9aaa95
- SHA256 a73709c1b5f1f875ee35f477c4e263a57050c36e2cff31ad1ceca17d9623e7cd
Malware Config
Extracted
-
remcos
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RemoteHost
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faststaynow.duckdns.org:5057
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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
-
keylog_crypt
false
-
keylog_file
logs.dat
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keylog_flag
false
-
keylog_folder
remcos
-
mouse_option
false
-
mutex
Rmc-C1BRX3
-
screenshot_crypt
false
-
screenshot_flag
false
-
screenshot_folder
Screenshots
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screenshot_path
%AppData%
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screenshot_time
10
-
take_screenshot_option
false
-
take_screenshot_time
5
Signatures
- Remcos
Remcos is a closed-source remote control and surveillance software.
- Blocklisted process makes network request 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
- Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Modifies registry class 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 21 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\Sandra 2023 Tax Organizer.exe"C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\Sandra 2023 Tax Organizer.exe"1⤵
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\Sandra 2023 Tax Organizer.exe"C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\Sandra 2023 Tax Organizer.exe"2⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Memory.vbs"3⤵
- Blocklisted process makes network request
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WindowsServices\VJQSJ.cmd" "4⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exePowerShell.exe -NoProfile -ExecutionPolicy Bypass -Command C:\Users\Admin\AppData\Roaming\WindowsServices\FNOBH.ps15⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\cmd.execmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Mouhn" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\Lopeunt.dll",EntryPoint /f & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\reg.exereg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Mouhn" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\Lopeunt.dll",EntryPoint /f3⤵
- Adds Run key to start application
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Memory.vbs
__PSScriptPolicyTest_mt4wk2qn.xan.ps1
FDNUA.vbs
VJQSJ.cmd
memory/224-2-0x0000000010000000-0x0000000011D0D000-memory.dmp
memory/224-1-0x0000000010869000-0x0000000010882000-memory.dmp
memory/224-18-0x0000000011CAD000-0x0000000011CDA000-memory.dmp
memory/224-9-0x0000000010000000-0x0000000011D0D000-memory.dmp
memory/224-0-0x0000000010000000-0x0000000011D0D000-memory.dmp
memory/224-5-0x0000000010000000-0x0000000011D0D000-memory.dmp
memory/224-19-0x0000000011CB2000-0x0000000011CDA000-memory.dmp
memory/224-20-0x0000000011CD9000-0x0000000011D06000-memory.dmp
memory/224-21-0x0000000011CDD000-0x0000000011D06000-memory.dmp
memory/1536-54-0x0000000005770000-0x0000000005792000-memory.dmp
memory/1536-52-0x0000000003070000-0x00000000030A6000-memory.dmp
memory/1536-68-0x0000000006670000-0x00000000066BC000-memory.dmp
memory/1536-67-0x0000000006620000-0x000000000663E000-memory.dmp
memory/1536-66-0x0000000006140000-0x0000000006494000-memory.dmp
memory/1536-56-0x0000000005980000-0x00000000059E6000-memory.dmp
memory/1536-55-0x0000000005910000-0x0000000005976000-memory.dmp
memory/1536-53-0x0000000005A10000-0x0000000006038000-memory.dmp
memory/4520-10-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-8-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-6-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-46-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-48-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-47-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-7-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-28-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-14-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-29-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-26-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-11-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-3-0x00000000001D0000-0x00000000001D1000-memory.dmp
memory/4520-12-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-13-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-22-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-71-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-72-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-73-0x0000000000410000-0x0000000000492000-memory.dmp
memory/4520-74-0x0000000000410000-0x0000000000492000-memory.dmp