remcos | a223dbd3e666c66e48d38bbc2e552a39bbfeb5f8b1663cdfa1d4a28543980c79

Analysis

max time kernel
148s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
26/01/2023, 14:18

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General

Target
EKX.exe
Size 958KB
Sample230126-rl9mysdh88
SHA256 a223dbd3e666c66e48d38bbc2e552a39bbfeb5f8b1663cdfa1d4a28543980c79
MD5 40f841f874a98d342f2176fbf26fca27
SHA1 d33e4e84a0740b38ed699eacccbb9686b7c72fb6
SHA512 a149a18b1f7be9782051770db1c101c6463fe710027ad465990aacf4287e00bad3cf7fa1a4cfadda448510088d9a50425cf0fb5305224ab7d55c62e80aae5178
SSDEEP 12288:/SkOvbnR8ey/Zhk2XD9zFqIGBDhyrwR9MEqfQ2u6l/SYUSxz+R/iIU/pSsGzXZ5t:Lv1XGLDv52VQmxz+inGd5u6HR+Q
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos eric-host 2023 persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Eric-Host 2023

craigjonson1.gotdns.ch:2011

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
trs.exe
delete_file
false
hide_file
false
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_path
%AppData%
mouse_option
false
mutex
Rmc-Z2FLAS
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
ee
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
4644	trs.exe
4580	trs.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	EKX.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ee = "\"C:\\Users\\Admin\\AppData\\Roaming\\trs.exe\""	EKX.exe
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Software\Microsoft\Windows\CurrentVersion\Run\	trs.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ee = "\"C:\\Users\\Admin\\AppData\\Roaming\\trs.exe\""	trs.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	trs.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ee = "\"C:\\Users\\Admin\\AppData\\Roaming\\trs.exe\""	trs.exe
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Software\Microsoft\Windows\CurrentVersion\Run\	EKX.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ee = "\"C:\\Users\\Admin\\AppData\\Roaming\\trs.exe\""	EKX.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	EKX.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4200 set thread context of 5088	4200	EKX.exe	89
PID 4644 set thread context of 4580	4644	trs.exe	94

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000_Classes\Local Settings	EKX.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4580	trs.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 4200 wrote to memory of 5088	4200	EKX.exe	89
PID 5088 wrote to memory of 1336	5088	EKX.exe	90
PID 5088 wrote to memory of 1336	5088	EKX.exe	90
PID 5088 wrote to memory of 1336	5088	EKX.exe	90
PID 1336 wrote to memory of 4436	1336	WScript.exe	91
PID 1336 wrote to memory of 4436	1336	WScript.exe	91
PID 1336 wrote to memory of 4436	1336	WScript.exe	91
PID 4436 wrote to memory of 4644	4436	cmd.exe	93
PID 4436 wrote to memory of 4644	4436	cmd.exe	93
PID 4436 wrote to memory of 4644	4436	cmd.exe	93
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94
PID 4644 wrote to memory of 4580	4644	trs.exe	94

C:\Users\Admin\AppData\Local\Temp\EKX.exe
"C:\Users\Admin\AppData\Local\Temp\EKX.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4200
- C:\Users\Admin\AppData\Local\Temp\EKX.exe
  "C:\Users\Admin\AppData\Local\Temp\EKX.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:5088
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\ezzosgczguposzkleuiw.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:1336
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\trs.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4436
    - - C:\Users\Admin\AppData\Roaming\trs.exe
        
        C:\Users\Admin\AppData\Roaming\trs.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:4644
      - C:\Users\Admin\AppData\Roaming\trs.exe
        
        "C:\Users\Admin\AppData\Roaming\trs.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:4580

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

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

ezzosgczguposzkleuiw.vbs

Path C:\Users\Admin\AppData\Local\Temp\ezzosgczguposzkleuiw.vbs
Size 398B
SHA256 b9c106ea9ba834520f1b3d32e7fd90750c83adaf9b3a464a13a9d56ae79fb84f
MD5 e3b82c3eed86d18b1cc374388f951eca
SHA1 cc50316b7993c4917af90675a746459b8d422115
SHA512 fd31315f512f7e3a13c496d46e59fa5cffbfcae263499bcfe8faa5e9288d2af5e64c33390ac1b20b66f900362d10cde44966876856e18d5f80dd221b4fd67943
MD5 SHA1 SHA512

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trs.exe

Path C:\Users\Admin\AppData\Roaming\trs.exe
Size 958KB
SHA256 a223dbd3e666c66e48d38bbc2e552a39bbfeb5f8b1663cdfa1d4a28543980c79
MD5 40f841f874a98d342f2176fbf26fca27
SHA1 d33e4e84a0740b38ed699eacccbb9686b7c72fb6
SHA512 a149a18b1f7be9782051770db1c101c6463fe710027ad465990aacf4287e00bad3cf7fa1a4cfadda448510088d9a50425cf0fb5305224ab7d55c62e80aae5178
SSDEEP 12288:/SkOvbnR8ey/Zhk2XD9zFqIGBDhyrwR9MEqfQ2u6l/SYUSxz+R/iIU/pSsGzXZ5t:Lv1XGLDv52VQmxz+inGd5u6HR+Q
MD5 SHA1 SHA512 SSDEEP

Submit Download

trs.exe

Path C:\Users\Admin\AppData\Roaming\trs.exe
Size 958KB
SHA256 a223dbd3e666c66e48d38bbc2e552a39bbfeb5f8b1663cdfa1d4a28543980c79
MD5 40f841f874a98d342f2176fbf26fca27
SHA1 d33e4e84a0740b38ed699eacccbb9686b7c72fb6
SHA512 a149a18b1f7be9782051770db1c101c6463fe710027ad465990aacf4287e00bad3cf7fa1a4cfadda448510088d9a50425cf0fb5305224ab7d55c62e80aae5178
SSDEEP 12288:/SkOvbnR8ey/Zhk2XD9zFqIGBDhyrwR9MEqfQ2u6l/SYUSxz+R/iIU/pSsGzXZ5t:Lv1XGLDv52VQmxz+inGd5u6HR+Q
MD5 SHA1 SHA512 SSDEEP

Submit Download

trs.exe

Path C:\Users\Admin\AppData\Roaming\trs.exe
Size 958KB
SHA256 a223dbd3e666c66e48d38bbc2e552a39bbfeb5f8b1663cdfa1d4a28543980c79
MD5 40f841f874a98d342f2176fbf26fca27
SHA1 d33e4e84a0740b38ed699eacccbb9686b7c72fb6
SHA512 a149a18b1f7be9782051770db1c101c6463fe710027ad465990aacf4287e00bad3cf7fa1a4cfadda448510088d9a50425cf0fb5305224ab7d55c62e80aae5178
SSDEEP 12288:/SkOvbnR8ey/Zhk2XD9zFqIGBDhyrwR9MEqfQ2u6l/SYUSxz+R/iIU/pSsGzXZ5t:Lv1XGLDv52VQmxz+inGd5u6HR+Q
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/4200-133-0x0000000005A90000-0x0000000006034000-memory.dmp

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memory/4200-134-0x0000000005400000-0x0000000005492000-memory.dmp

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memory/4200-135-0x00000000054C0000-0x00000000054CA000-memory.dmp

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memory/4200-136-0x0000000005990000-0x0000000005A2C000-memory.dmp

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memory/4200-132-0x0000000000970000-0x0000000000A64000-memory.dmp

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memory/4580-152-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/4580-151-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/4580-153-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/4580-154-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/5088-142-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/5088-140-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/5088-139-0x0000000000400000-0x000000000047F000-memory.dmp

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memory/5088-138-0x0000000000400000-0x000000000047F000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads