remcos | f23448b86d797211063a5792344b34aab2900bbabb8c7b211f4046d95295ac24

General

Target
tmpj_1yo5r_.exe
Size 109KB
Sample260601-2fa8bagt41
SHA256 f23448b86d797211063a5792344b34aab2900bbabb8c7b211f4046d95295ac24
MD5 cf640dd6f1d67416137fa2a1903c4e59
SHA1 a7c1ea4f8ea1d00e87d0df62d721ebf40521b6ac
SHA512 c652cf7e936944c157587e892fa3c9111b25926f6a925fdbf4c2ecf660a86bbc4c0f4ffc629c229f0e2ea60ba7a7ed1f73e7a8584caa4d1f15b157fb92c39b5d
SSDEEP 3072:shzYTGWVvJ8f2v1TbPzuMsIFSHNThy+JP/P6Ir8zGadBmVn2:shzOv2fM13jsIFSHNT7P/P6cCjmV2
TLSH
T18CB31913FA4AD1B2E41141F106426F32DEBCBC3736092173D38FC641AE79896D466EAE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

doc40401 discovery remcos persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

DOC40401

C2

tobi12345.hopto.org:40401
tobi12345.hopto.org:50501

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
win32.exe
copy_folder
win32
delete_file
false
hide_file
false
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
remcos_ysxrsrtjxg
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
win32
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	tmpj_1yo5r_.exe

Executes dropped EXE 2 IoCs

pid	Process
1452	win32.exe
4580	win32.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-1-5-21-540052884-2969440504-464782435-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\win32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\win32\\win32.exe\""	tmpj_1yo5r_.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\win32 = "\"C:\\Users\\Admin\\AppData\\Roaming\\win32\\win32.exe\""	win32.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 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	tmpj_1yo5r_.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win32.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4736	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4736	PING.EXE

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4872 wrote to memory of 4052	4872	tmpj_1yo5r_.exe	87
PID 4052 wrote to memory of 4736	4052	cmd.exe	89
PID 4052 wrote to memory of 4580	4052	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\tmpj_1yo5r_.exe
"C:\Users\Admin\AppData\Local\Temp\tmpj_1yo5r_.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4872
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4052
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4736
- - C:\Users\Admin\AppData\Roaming\win32\win32.exe
    "C:\Users\Admin\AppData\Roaming\win32\win32.exe"
    3⤵
    - Executes dropped EXE
    PID:4580

C:\Users\Admin\AppData\Roaming\win32\win32.exe
"C:\Users\Admin\AppData\Roaming\win32\win32.exe"
1⤵
- Executes dropped EXE
- Adds Run key to start application
- System Location Discovery: System Language Discovery
PID:1452

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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install.bat

Path C:\Users\Admin\AppData\Local\Temp\install.bat
Size 97B
SHA256 3480feb5199cf8033b53e96b28d2de76e7a2d32ff1249270096e2b799c1c8343
MD5 e5b1715209f206f20518c1f38277d248
SHA1 94ebbe3d97363fcdbc67696739cc4e4d4d2c8979
SHA512 bf02ea588273755b2e360510c2cbdf66b74f93a6b0f74db72b9dd15aedd4d42798764ba3eeccc61ce4efb2b81b221d430a8484dc44d34c13b3b46046bba6ebe4
TLSH
T145B01233088081EE99020D570DBC7919E111E484264A34084E5C8C891D72440F5C6410
MD5 SHA1 SHA512 TLSH

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win32.exe

Path C:\Users\Admin\AppData\Roaming\win32\win32.exe
Size 109KB
SHA256 f23448b86d797211063a5792344b34aab2900bbabb8c7b211f4046d95295ac24
MD5 cf640dd6f1d67416137fa2a1903c4e59
SHA1 a7c1ea4f8ea1d00e87d0df62d721ebf40521b6ac
SHA512 c652cf7e936944c157587e892fa3c9111b25926f6a925fdbf4c2ecf660a86bbc4c0f4ffc629c229f0e2ea60ba7a7ed1f73e7a8584caa4d1f15b157fb92c39b5d
SSDEEP 3072:shzYTGWVvJ8f2v1TbPzuMsIFSHNThy+JP/P6Ir8zGadBmVn2:shzOv2fM13jsIFSHNT7P/P6cCjmV2
TLSH
T18CB31913FA4AD1B2E41141F106426F32DEBCBC3736092173D38FC641AE79896D466EAE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1452-11-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4580-10-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4872-0-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4872-5-0x0000000000400000-0x0000000000418000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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