remcos | 9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a

Analysis

max time kernel
118s
max time network
119s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19-12-2024 01:54

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General

Target

9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
Size

293KB
MD5

90685b3446365662273f08298a9724c3
SHA1

2f1881d820114d9e567aaf3185754f6d0cdc0645
SHA256

9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a
SHA512

d7675048d87e3265665339b9f57c34d9d6070507d935e7e8d7bcb2681434c3a8e6a6999aa901f0d9bf1ac872079a95daaa595eb04340cf14175323f3154ca981
SSDEEP

6144:f5ZdP3uQMi7StiABLHGEEUqdGrxrL0Or1jQQdy02sbYB:fdP3d2uO0Or1WkbYB

Score

10^/10

remcos planes discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

2.1.0 Pro

Botnet

Planes

remfff.duckdns.org:48604

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
csrss.exe
copy_folder
csrss.exe
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
RemcosXs-L20P2E
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
csrss.exe
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
1416	csrss.exe
2368	csrss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss.exe = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\\csrss.exe\""	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss.exe = "\"C:\\Users\\Admin\\AppData\\Roaming\\csrss.exe\\csrss.exe\""	csrss.exe

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 6 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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe
1416	csrss.exe

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
1416	csrss.exe
1416	csrss.exe
2368	csrss.exe

Suspicious use of WriteProcessMemory 35 IoCs

description	pid	Process	procid_target
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 2892 wrote to memory of 876	2892	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	89
PID 876 wrote to memory of 1108	876	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	90
PID 876 wrote to memory of 1108	876	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	90
PID 876 wrote to memory of 1108	876	9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe	90
PID 1108 wrote to memory of 2436	1108	WScript.exe	91
PID 1108 wrote to memory of 2436	1108	WScript.exe	91
PID 1108 wrote to memory of 2436	1108	WScript.exe	91
PID 2436 wrote to memory of 1416	2436	cmd.exe	93
PID 2436 wrote to memory of 1416	2436	cmd.exe	93
PID 2436 wrote to memory of 1416	2436	cmd.exe	93
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98
PID 1416 wrote to memory of 2368	1416	csrss.exe	98

C:\Users\Admin\AppData\Local\Temp\9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
"C:\Users\Admin\AppData\Local\Temp\9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2892
- C:\Users\Admin\AppData\Local\Temp\9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe
  "C:\Users\Admin\AppData\Local\Temp\9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:876
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1108
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2436
    - - C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe
        
        C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1416
      - C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe
        
        C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:2368

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs

Filesize
422B

MD5
f3ed21a8dbf48ccf6487d68cd12b8e89

SHA1
37b725cdc3bb8b91cb6242529721a2c3f1f03af2

SHA256
a2c8cc5a927929bb186c39f2deefa5ca869ab705ada7b13c2687a54c99df0416

SHA512
da85bc3517b3d085a29ae9c1a200ca7ae6c46f6bff4d5dc199bf493e6eda9cd223acf3945a4e24ae24f5a7fbc134f0345d725a6af1061b6c3f526ffec599851f

Download Submit
C:\Users\Admin\AppData\Roaming\csrss.exe\csrss.exe

Filesize
293KB

MD5
90685b3446365662273f08298a9724c3

SHA1
2f1881d820114d9e567aaf3185754f6d0cdc0645

SHA256
9fa65520148046f0e3791249d36a42ec4401f8f5db36091bc63156c778e4252a

SHA512
d7675048d87e3265665339b9f57c34d9d6070507d935e7e8d7bcb2681434c3a8e6a6999aa901f0d9bf1ac872079a95daaa595eb04340cf14175323f3154ca981

Download Submit
C:\Users\Admin\AppData\Roaming\remcos\logs.dat

Filesize
79B

MD5
fa66a1422cbc7fe1bbfc3621150f4018

SHA1
316d5cca2644650192c25dcb3a182d012adeb065

SHA256
afc336acbb5843c1766330a8f9431a5c5548121c771ec5e80649071bae0137e2

SHA512
e118894009d3b5db3a945507c607328198f972af404b74d3a394e0d6e254e6c5e36ed319fd20d38ebef6fb1ae2506a0fdac8f5aaa716b4691071cf1ea3a0e47c

Download Submit
memory/876-13-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/876-3-0x0000000077DD2000-0x0000000077DD3000-memory.dmp

Filesize
4KB

Download
memory/876-5-0x00000000001C0000-0x00000000001C1000-memory.dmp

Filesize
4KB

Download
memory/876-6-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2368-24-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2368-20-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2368-22-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2368-26-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2368-28-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2892-4-0x00000000025A0000-0x000000000261B000-memory.dmp

Filesize
492KB

Download
memory/2892-2-0x00000000025A0000-0x000000000261B000-memory.dmp

Filesize
492KB

Download
memory/2892-0-0x00000000025A0000-0x000000000261B000-memory.dmp

Filesize
492KB

Download
memory/2892-1-0x0000000077DD2000-0x0000000077DD3000-memory.dmp

Filesize
4KB

Download