remcos | 4a9455b9f7f0266a0630aec9285a3eb91a3b929e1d22f0d6a574edf7f18cf2fb

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
01/06/2026, 22:20

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General

Target
tmprv9oph73.exe
Size 137KB
Sample260601-19ft8ags71
SHA256 4a9455b9f7f0266a0630aec9285a3eb91a3b929e1d22f0d6a574edf7f18cf2fb
MD5 0585bd8f25a7305792b8e2030207d980
SHA1 90533681e28a4775876dd09c601fef6e5c0364b1
SHA512 3a91345c0ab29d6bf077a9c5121eef720f09cab74e13d0d813dee91c69ae648a7f3923e275af17f8622b9340743cbcac021dcaa25095f6408d6a246ef60995b4
SSDEEP 1536:ITHiPBX4nDzMyRXGHrc9YRHqbTypgpmb5Q+ZReSdhk/J+YLgD3mrxb53cSuYQjKt:xPd4n/M+WLcilrpgGH/GwY87mVmIX4M
TLSH
T1D4D302007653D3A2E9D2663B4418095993B7F301766BAB2F388C326CCE573C77B616E8
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

host discovery remcos 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

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

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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	tmprv9oph73.exe

Executes dropped EXE 4 IoCs

pid	Process
2260	wn2ra4ohzdr.exe
2684	wn2ra4ohzdr.exe
4660	wn2ra4ohzdr.exe
1432	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-1-5-21-540052884-2969440504-464782435-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\raj4dkhhiap = "C:\\Users\\Admin\\AppData\\Roaming\\raj4dkhhiap\\wn2ra4ohzdr.exe"	tmprv9oph73.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2260 set thread context of 4660	2260	wn2ra4ohzdr.exe	92
PID 2684 set thread context of 1432	2684	wn2ra4ohzdr.exe	93

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmprv9oph73.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wn2ra4ohzdr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wn2ra4ohzdr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wn2ra4ohzdr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4660	wn2ra4ohzdr.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 2684	4268	tmprv9oph73.exe	91
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2260 wrote to memory of 4660	2260	wn2ra4ohzdr.exe	92
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93
PID 2684 wrote to memory of 1432	2684	wn2ra4ohzdr.exe	93

C:\Users\Admin\AppData\Local\Temp\tmprv9oph73.exe
"C:\Users\Admin\AppData\Local\Temp\tmprv9oph73.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
  "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2684
- - C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
    "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
    3⤵
    - Executes dropped EXE
    PID:1432

C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2260
- C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
  "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4660

Network

MITRE ATT&CK Enterprise v16

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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wn2ra4ohzdr.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\wn2ra4ohzdr.exe.log
Size 1KB
SHA256 48178f884b8a4dd96e330b210b0530667d9473a7629fc6b4ad12b614bf438ee8
MD5 7ebe314bf617dc3e48b995a6c352740c
SHA1 538f643b7b30f9231a3035c448607f767527a870
SHA512 0ba9d8f4244c15285e254d27b4bff7c49344ff845c48bc0bf0d8563072fab4d6f7a6abe6b6742e8375a08e9a3b3e5d5dc4937ab428dbe2dd8e62892fda04507e
TLSH
T17721EF303222B4D84D022F430C0869C513FF4758B664EE2CB959331EDD2A017AF321E3
MD5 SHA1 SHA512 TLSH

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wn2ra4ohzdr.exe

Path C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
Size 137KB
SHA256 9c584445d1c800c69e95a06d1388d4165b2e98527b4e3ae390110b02a97bc882
MD5 9f6094000f12acf8362e18c6a23b5419
SHA1 9a7b77331509d87ba6dee32b6df30997be664db8
SHA512 dd6d7f829f3b1fc7976580b0f8010134311572c6c04075bff54d1263b147c62bcbc25434f9080aebdf40f74d877a95372aeb553e451b79f5a911e7068e7e4ec2
SSDEEP 1536:ITHiPBX4nDzMyRXGHrc9YRHqbTypgpmb5Q+ZReSdhk/J+YLgD3mrxb53cSuYQjKd:xPd4n/M+WLcilrpgGH/GwY87mVmIX48
TLSH
T158D302007653D3A2E8D2663B4418095993B7F301766BA72F388C326CCE573C77B616E8
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2260-31-0x0000000005300000-0x0000000005310000-memory.dmp

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memory/2260-10-0x0000000005300000-0x0000000005310000-memory.dmp

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memory/2684-32-0x00000000053B0000-0x00000000053C0000-memory.dmp

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memory/2684-13-0x00000000053B0000-0x00000000053C0000-memory.dmp

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memory/4268-4-0x0000000004E40000-0x0000000004E4A000-memory.dmp

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memory/4268-5-0x00000000050B0000-0x00000000050D0000-memory.dmp

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memory/4268-0-0x0000000000420000-0x0000000000448000-memory.dmp

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memory/4268-3-0x0000000004E30000-0x0000000004E40000-memory.dmp

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memory/4268-2-0x0000000004EB0000-0x0000000004F42000-memory.dmp

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memory/4268-1-0x0000000005460000-0x0000000005A04000-memory.dmp

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memory/4660-15-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4660-17-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4660-16-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4660-14-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4660-20-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/4660-21-0x0000000000400000-0x0000000000417000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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