remcos | 31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00

Analysis

max time kernel
143s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
18/06/2024, 20:07

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General

Target
31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe
Size 138KB
Sample240618-yv5tpazdnk
SHA256 31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00
MD5 24d08850e619310b3894a21c78ee8ed2
SHA1 7228e05e78529d0d41f5e4b8f16ea844aa5b069d
SHA512 8d0dff2e79a2b51c47a16173373cc7747eb8253a0bc41343dbc5acbdc3277eecbdb7f0d35a10bf710ee6d04f03e9bbaaf9f6828f371321a4169d2acd3ac5f017
SSDEEP 3072:xPd4n/M+WLcilrpgGH/GwY87mVmIXhIHO:xP6/M+WLckOBhVmIn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos host persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

systemcontrol.ddns.net:45000
systemcontrol2.ddns.net:45000

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
OfficeUpgrade.exe
copy_folder
OfficeUpgrade
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
false
install_path
%AppData%
keylog_crypt
true
keylog_file
Upgrader.dat
keylog_flag
false
keylog_folder
Upgrader
keylog_path
%AppData%
mouse_option
false
mutex
req_khauflaoyr
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
OfficeUpgrade
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

detects Windows exceutables potentially bypassing UAC using eventvwr.exe 7 IoCs

resource	yara_rule
behavioral2/memory/4200-24-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-26-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-25-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-30-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-31-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-34-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/4200-39-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer

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-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe

Executes dropped EXE 2 IoCs

pid	Process
3940	wn2ra4ohzdr.exe
4200	wn2ra4ohzdr.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-1-5-21-3665033694-1447845302-680750983-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\raj4dkhhiap = "C:\\Users\\Admin\\AppData\\Roaming\\raj4dkhhiap\\wn2ra4ohzdr.exe"	31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3940 set thread context of 4200	3940	wn2ra4ohzdr.exe	94

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4200	wn2ra4ohzdr.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2844 wrote to memory of 3940	2844	31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe	93
PID 2844 wrote to memory of 3940	2844	31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe	93
PID 2844 wrote to memory of 3940	2844	31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe	93
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94
PID 3940 wrote to memory of 4200	3940	wn2ra4ohzdr.exe	94

C:\Users\Admin\AppData\Local\Temp\31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe
"C:\Users\Admin\AppData\Local\Temp\31d242df0d4d1dea7116d4abeba9f1478a20800aec3fd997433338c1debf3a00.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:2844
- C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
  "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:3940
- - C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
    "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetWindowsHookEx
    PID:4200

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3976,i,11049150160560877369,2866371920339304689,262144 --variations-seed-version --mojo-platform-channel-handle=3940 /prefetch:8
1⤵
PID:4504

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

wn2ra4ohzdr.exe

Path C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
Size 138KB
SHA256 95f988f4c6bad5fd0dadecdaeeae5c7a450a1fd459aee3bcc04472b2014995b2
MD5 6e24bf78f94b8f1219c35d257d8d9eb8
SHA1 c861189d82ba7b7daf3a634c36d974c2034016dc
SHA512 4fa343003dd49d630eed823939ee6d77998766bd6214979b074ab1b864c545d5a2eecbdaca1a113642e5e8363573f370befe45433e55ef2e5bbf2759938ebe19
SSDEEP 3072:xPd4n/M+WLcilrpgGH/GwY87mVmIXhIHp:xP6/M+WLckOBhVmIA
MD5 SHA1 SHA512 SSDEEP

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memory/2844-20-0x0000000074B10000-0x00000000752C0000-memory.dmp

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memory/2844-1-0x0000000000D00000-0x0000000000D28000-memory.dmp

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memory/2844-2-0x0000000005DE0000-0x0000000006384000-memory.dmp

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memory/2844-3-0x0000000005700000-0x0000000005792000-memory.dmp

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memory/2844-4-0x00000000057D0000-0x00000000057DA000-memory.dmp

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memory/2844-5-0x0000000074B10000-0x00000000752C0000-memory.dmp

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memory/2844-6-0x00000000058C0000-0x00000000058E0000-memory.dmp

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memory/2844-0-0x0000000074B1E000-0x0000000074B1F000-memory.dmp

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memory/3940-22-0x0000000074B10000-0x00000000752C0000-memory.dmp

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memory/3940-21-0x0000000074B10000-0x00000000752C0000-memory.dmp

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memory/3940-38-0x0000000074B10000-0x00000000752C0000-memory.dmp

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memory/4200-24-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-26-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-25-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-23-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-30-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-31-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-34-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4200-39-0x0000000000400000-0x0000000000417000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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