remcos | 9edb362c45d38d223d521d49aed8014917d81a7771026616243c1fa4ab409d1d

Analysis

max time kernel
149s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
11/05/2024, 02:09

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General

Target
TAX ORGANIZER 2023/g2m.dll
Size 27.9MB
Sample240511-clep9aaa95
SHA256 d7350580234b4ec776d869758ffab607f2ff42efe3a938b140ad182417cd4e29
MD5 0a2c9acac48e85f0be788220ff712a3e
SHA1 2e1fbba29f518b8e98bc4bb0dfc3ef1c6d8f2261
SHA512 9fbb5242355feb5b0cf1c4f00ae0fe0646aba1d11338fe078b3e37defda0e1b164b19a02a14568bc7d7bf2716b4a38dbc16da744230c01550b2642d50df4b298
SSDEEP 393216:lezzyEDJ63vIMxrsjnh7CHfqkALvIzhJRYiE/XWKNnBcRlp:8zHCvRGwCXUhJRYiE+0nBcRT
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
33	3684	WScript.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	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-1-5-21-1337824034-2731376981-3755436523-1000\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
3296	regsvr32.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3284	powershell.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000_Classes\Local Settings	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3284	powershell.exe
3284	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3284	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 636 wrote to memory of 3296	636	regsvr32.exe	83
PID 636 wrote to memory of 3296	636	regsvr32.exe	83
PID 636 wrote to memory of 3296	636	regsvr32.exe	83
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 3296 wrote to memory of 2996	3296	regsvr32.exe	87
PID 2996 wrote to memory of 3684	2996	regsvr32.exe	88
PID 2996 wrote to memory of 3684	2996	regsvr32.exe	88
PID 2996 wrote to memory of 3684	2996	regsvr32.exe	88
PID 3296 wrote to memory of 4024	3296	regsvr32.exe	89
PID 3296 wrote to memory of 4024	3296	regsvr32.exe	89
PID 3296 wrote to memory of 4024	3296	regsvr32.exe	89
PID 4024 wrote to memory of 972	4024	cmd.exe	91
PID 4024 wrote to memory of 972	4024	cmd.exe	91
PID 4024 wrote to memory of 972	4024	cmd.exe	91
PID 3684 wrote to memory of 5008	3684	WScript.exe	95
PID 3684 wrote to memory of 5008	3684	WScript.exe	95
PID 3684 wrote to memory of 5008	3684	WScript.exe	95
PID 5008 wrote to memory of 3284	5008	cmd.exe	98
PID 5008 wrote to memory of 3284	5008	cmd.exe	98
PID 5008 wrote to memory of 3284	5008	cmd.exe	98

C:\Windows\system32\regsvr32.exe
regsvr32 /s "C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\g2m.dll"
1⤵
- Suspicious use of WriteProcessMemory
PID:636
- C:\Windows\SysWOW64\regsvr32.exe
  /s "C:\Users\Admin\AppData\Local\Temp\TAX ORGANIZER 2023\g2m.dll"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:3296
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\SysWOW64\regsvr32.exe"
    3⤵
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:2996
  - - C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Memory.vbs"
      4⤵
      Blocklisted process makes network request
      Checks computer location settings
      Suspicious use of WriteProcessMemory
      PID:3684
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WindowsServices\VJQSJ.cmd" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:5008
      - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        PowerShell.exe -NoProfile -ExecutionPolicy Bypass -Command C:\Users\Admin\AppData\Roaming\WindowsServices\FNOBH.ps1
        6⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3284
- - 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
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4024
  - - 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
      4⤵
      Adds Run key to start application
      PID:972

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

Query Registry

T1012

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

Submit Download

__PSScriptPolicyTest_gvkorsbk.c14.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gvkorsbk.c14.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

Submit Download

FDNUA.vbs

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\FDNUA.vbs
Size 276B
SHA256 5819dd543e8a14f37c805762dcd5a5d29d7dad9ff8c16041605576cab4fb2fd0
MD5 0f6fb21da68a3c96727f7b3f41c6396e
SHA1 556af81855f434e38ad4a48a99f1c026ee7490d8
SHA512 26ca306248dcd8af7e02cad85058823b6f46a49d0af6264311d096dd942471ca151b6978a813270b3858e3309f55313006422a836fcdf11bd56042513c2fbd9b
MD5 SHA1 SHA512

Submit Download

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/2996-12-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-15-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-9-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-7-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-6-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-3-0x0000000000C00000-0x0000000000C01000-memory.dmp

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memory/2996-44-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-14-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-13-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-10-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-16-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-18-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-45-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-23-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-72-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-27-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-26-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/2996-73-0x0000000000970000-0x00000000009F2000-memory.dmp

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memory/3284-51-0x0000000005A20000-0x0000000005A42000-memory.dmp

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memory/3284-53-0x0000000005CA0000-0x0000000005D06000-memory.dmp

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memory/3284-65-0x00000000062C0000-0x000000000630C000-memory.dmp

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memory/3284-49-0x0000000004D00000-0x0000000004D36000-memory.dmp

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memory/3284-50-0x0000000005370000-0x0000000005998000-memory.dmp

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memory/3284-64-0x0000000006290000-0x00000000062AE000-memory.dmp

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memory/3284-52-0x0000000005BC0000-0x0000000005C26000-memory.dmp

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memory/3284-63-0x0000000005E10000-0x0000000006164000-memory.dmp

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memory/3296-5-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/3296-24-0x0000000011CD9000-0x0000000011D06000-memory.dmp

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memory/3296-1-0x0000000010869000-0x0000000010882000-memory.dmp

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memory/3296-11-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/3296-2-0x0000000010000000-0x0000000011D0D000-memory.dmp

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memory/3296-0-0x0000000010000000-0x0000000011D0D000-memory.dmp

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