remcos | 9edb362c45d38d223d521d49aed8014917d81a7771026616243c1fa4ab409d1d

Analysis

max time kernel
149s
max time network
155s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
11/05/2024, 02:09

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General

Target
TAX ORGANIZER 2023/Sandra 2023 Tax Organizer.exe
Size 31KB
Sample240511-clep9aaa95
SHA256 a73709c1b5f1f875ee35f477c4e263a57050c36e2cff31ad1ceca17d9623e7cd
MD5 4db45c5fdb9e115b922bdf007523f082
SHA1 90297382a170ff3ea7931db2425329d0b2f70f04
SHA512 7f0bcb2ee96c523cce764d1ec7d197d3aadddcf6fae71b63e88c3a26883b2f2fb4a446187adfbb023be779056ebc0ea50a785c72bbe97bb7dca41a810d0ff6c7
SSDEEP 384:V4Kj/M8y6ryzqEt7a9Oey+IFdP64VYaEwDtiBgxoxlnLr2STchsCxXBhgBx4eMDg:VHDXr+VWOV+csoHViBBn+hRIqeMDGt
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos remotehost execution persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

faststaynow.duckdns.org:5057

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-C1BRX3
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Blocklisted process makes network request 1 IoCs

flow	pid	Process
11	2436	WScript.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\*Mouhn = "rundll32.exe C:\\Users\\Admin\\AppData\\Roaming\\Lopeunt.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1152	Sandra 2023 Tax Organizer.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2732	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2732	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2732	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 1844	1152	Sandra 2023 Tax Organizer.exe	30
PID 1152 wrote to memory of 2724	1152	Sandra 2023 Tax Organizer.exe	33
PID 1152 wrote to memory of 2724	1152	Sandra 2023 Tax Organizer.exe	33
PID 1152 wrote to memory of 2724	1152	Sandra 2023 Tax Organizer.exe	33
PID 1152 wrote to memory of 2724	1152	Sandra 2023 Tax Organizer.exe	33
PID 2724 wrote to memory of 2400	2724	cmd.exe	35
PID 2724 wrote to memory of 2400	2724	cmd.exe	35
PID 2724 wrote to memory of 2400	2724	cmd.exe	35
PID 2724 wrote to memory of 2400	2724	cmd.exe	35
PID 1844 wrote to memory of 2436	1844	Sandra 2023 Tax Organizer.exe	36
PID 1844 wrote to memory of 2436	1844	Sandra 2023 Tax Organizer.exe	36
PID 1844 wrote to memory of 2436	1844	Sandra 2023 Tax Organizer.exe	36
PID 1844 wrote to memory of 2436	1844	Sandra 2023 Tax Organizer.exe	36
PID 2436 wrote to memory of 336	2436	WScript.exe	39
PID 2436 wrote to memory of 336	2436	WScript.exe	39
PID 2436 wrote to memory of 336	2436	WScript.exe	39
PID 2436 wrote to memory of 336	2436	WScript.exe	39
PID 336 wrote to memory of 2732	336	cmd.exe	41
PID 336 wrote to memory of 2732	336	cmd.exe	41
PID 336 wrote to memory of 2732	336	cmd.exe	41
PID 336 wrote to memory of 2732	336	cmd.exe	41

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
PID:1152
- 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⤵
  - Suspicious use of WriteProcessMemory
  PID:1844
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Memory.vbs"
    3⤵
    - Blocklisted process makes network request
    - Suspicious use of WriteProcessMemory
    PID:2436
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Roaming\WindowsServices\VJQSJ.cmd" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:336
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        PowerShell.exe -NoProfile -ExecutionPolicy Bypass -Command C:\Users\Admin\AppData\Roaming\WindowsServices\FNOBH.ps1
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2732
- C:\Windows\SysWOW64\cmd.exe
  cmd.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 & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2724
- - C:\Windows\SysWOW64\reg.exe
    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
    3⤵
    - Adds Run key to start application
    PID:2400

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

Memory.vbs

Path C:\Users\Admin\AppData\Local\Temp\Memory.vbs
Size 6.8MB
SHA256 f90c2ec81fb78e657dc3d359bcf59a557d56ddc8e1b33e9b205707a221e21f36
MD5 8f3213dd5a26f9faf8b278b11c3c2c8f
SHA1 e2af8417a760edbcad8ff75ba7eed8f7bd653487
SHA512 0bbe6acf8ab4e704fef80960eb50044e2978cf3d8b38aea837ae49019be24aa4c6090ba0e84d3d4c636697079e6d44323e976010e83ea93f9f7db95c2d2f7159
SSDEEP 24576:F8jVQ8jVT5tlxuSylBNxaR0L3j8jVt8jVj8jVf8jVv8jVV8jVd8jVK8jV88jVs8b:klxMimWUcPp5o122lReRWSCMaE
MD5 SHA1 SHA512 SSDEEP

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VJQSJ.cmd

Path C:\Users\Admin\AppData\Roaming\WindowsServices\VJQSJ.cmd
Size 75B
SHA256 b05c782898be147fc51e30f958325cf4d0494a46ee37ae8bbe52d47202aa792e
MD5 98a00a7606758604e4af1ffcd456465a
SHA1 14f816305992f17a0c082f307d3f73ab94c1f859
SHA512 99c37921a6ed3c380848ee10a1edc5f61e807bdc25db9f4f64f9242029c12dc0430e72483c59716d1270714241f7cf8180564b49180ba63d4961fb70dbd60901
MD5 SHA1 SHA512

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memory/1152-0-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/1152-3-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/1152-25-0x0000000011CA1000-0x0000000011CA8000-memory.dmp

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memory/1152-2-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/1152-16-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/1152-1-0x0000000010869000-0x0000000010882000-memory.dmp

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memory/1844-13-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-15-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-6-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

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memory/1844-14-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-17-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-19-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-18-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-20-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-21-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-23-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-24-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-4-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-31-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-8-0x0000000000250000-0x0000000000251000-memory.dmp

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memory/1844-33-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-32-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-50-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-51-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-10-0x0000000000250000-0x0000000000251000-memory.dmp

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memory/1844-69-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-70-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-71-0x00000000001C0000-0x0000000000242000-memory.dmp

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memory/1844-72-0x00000000001C0000-0x0000000000242000-memory.dmp

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