remcos | 00af319b34a1d60e3d76e665f256c692cac18f3c3ca7157051147f16b1040887

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
10/05/2024, 02:01

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General

Target
Tax Organizer 2023/g2m.dll
Size 25.9MB
Sample240510-cfyk6scd81
SHA256 2643dbabde4595b6505a2c5f74810022a75322cb1c0a7a889783ad794f55df7d
MD5 485b8cc54d8a2fc27a1c0c1cafe21811
SHA1 b0011058e2babc680273aacf9eb382e85532d5a5
SHA512 e7e7c207d76e00b047875b0937b6b81dbfd2623095095aaff656e2b9c90c49b5ba710bf9f997af346a928f7d1967cb39ee842e6ee62792aa5d100d90bdd86560
SSDEEP 196608:+5H3zHriM3lONIfjm0S6VFWxtswdO8Nw3MRfW8+IiAp7kz8roTsWbbh7nkMM9haK:8rmKSPoTsWbbh7nkMGRNc4Y/kyZpJIgi
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-DRFJJD
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 3 IoCs

flow	pid	Process
27	4516	WScript.exe
29	4516	WScript.exe
32	4516	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-1-5-21-711569230-3659488422-571408806-1000\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-1-5-21-711569230-3659488422-571408806-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\*Chrome = "rundll32.exe C:\\Users\\Admin\\AppData\\Roaming\\HEARTB.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2204	regsvr32.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2884	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-1-5-21-711569230-3659488422-571408806-1000_Classes\Local Settings	regsvr32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2884	powershell.exe
2884	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2884	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4024 wrote to memory of 2204	4024	regsvr32.exe	84
PID 4024 wrote to memory of 2204	4024	regsvr32.exe	84
PID 4024 wrote to memory of 2204	4024	regsvr32.exe	84
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 3884	2204	regsvr32.exe	92
PID 2204 wrote to memory of 2088	2204	regsvr32.exe	94
PID 2204 wrote to memory of 2088	2204	regsvr32.exe	94
PID 2204 wrote to memory of 2088	2204	regsvr32.exe	94
PID 2088 wrote to memory of 4700	2088	cmd.exe	96
PID 2088 wrote to memory of 4700	2088	cmd.exe	96
PID 2088 wrote to memory of 4700	2088	cmd.exe	96
PID 3884 wrote to memory of 4516	3884	regsvr32.exe	97
PID 3884 wrote to memory of 4516	3884	regsvr32.exe	97
PID 3884 wrote to memory of 4516	3884	regsvr32.exe	97
PID 4516 wrote to memory of 2376	4516	WScript.exe	100
PID 4516 wrote to memory of 2376	4516	WScript.exe	100
PID 4516 wrote to memory of 2376	4516	WScript.exe	100
PID 2376 wrote to memory of 2884	2376	cmd.exe	103
PID 2376 wrote to memory of 2884	2376	cmd.exe	103
PID 2376 wrote to memory of 2884	2376	cmd.exe	103

C:\Windows\system32\regsvr32.exe
regsvr32 /s "C:\Users\Admin\AppData\Local\Temp\Tax Organizer 2023\g2m.dll"
1⤵
- Suspicious use of WriteProcessMemory
PID:4024
- 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:2204
- - C:\Windows\SysWOW64\regsvr32.exe
    "C:\Windows\SysWOW64\regsvr32.exe"
    3⤵
    - Modifies registry class
    - Suspicious use of WriteProcessMemory
    PID:3884
  - - 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:4516
    - - 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:2376
      - 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:2884
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Chrome" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\HEARTB.dll",EntryPoint /f & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2088
  - - C:\Windows\SysWOW64\reg.exe
      reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Chrome" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\HEARTB.dll",EntryPoint /f
      4⤵
      Adds Run key to start application
      PID:4700

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

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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_zjxtcfvn.no0.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zjxtcfvn.no0.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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/2204-1-0x0000000010B6A000-0x0000000010B84000-memory.dmp

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memory/2204-4-0x0000000010000000-0x0000000011A85000-memory.dmp

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memory/2204-5-0x0000000010000000-0x0000000011A85000-memory.dmp

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memory/2204-11-0x0000000010000000-0x0000000011A85000-memory.dmp

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memory/2204-0-0x0000000010000000-0x0000000011A85000-memory.dmp

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memory/2884-66-0x0000000006950000-0x000000000696E000-memory.dmp

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memory/2884-65-0x00000000064E0000-0x0000000006834000-memory.dmp

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memory/2884-54-0x0000000006290000-0x00000000062F6000-memory.dmp

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memory/2884-55-0x0000000006370000-0x00000000063D6000-memory.dmp

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memory/2884-53-0x0000000005B10000-0x0000000005B32000-memory.dmp

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memory/2884-52-0x0000000005BB0000-0x00000000061D8000-memory.dmp

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memory/2884-51-0x0000000003370000-0x00000000033A6000-memory.dmp

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memory/2884-67-0x00000000069A0000-0x00000000069EC000-memory.dmp

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memory/3884-12-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-46-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-47-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-23-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-18-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-15-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-16-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-14-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-13-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-2-0x0000000001130000-0x0000000001131000-memory.dmp

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memory/3884-10-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-7-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-9-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-6-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-70-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-71-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-73-0x00000000010A0000-0x0000000001122000-memory.dmp

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memory/3884-72-0x00000000010A0000-0x0000000001122000-memory.dmp

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