remcos | d2a1375e9e0c3c8fbc3496cb6c1690e2c47d167a5cac476b528ad2c051f85a52

Analysis

max time kernel
27s
max time network
140s
platform
windows10_x64
resource
win10v20210410
submitted
25/06/2021, 16:05

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General

Target
df8c0ae70c93c86d36fa7a2aa827c4ad.exe
Size 132KB
Sample210625-433e2f38rs
SHA256 d2a1375e9e0c3c8fbc3496cb6c1690e2c47d167a5cac476b528ad2c051f85a52
MD5 df8c0ae70c93c86d36fa7a2aa827c4ad
SHA1 afe39baab2ab2ce0a7f9487103c0238f139802a6
SHA512 1e74b77edb32319d3dba713e2712b74e5da32ac0c917b57d97e1b39cf84a6afa59dad448c54d1637df929c14a984a4aed10ea4ea5e1019eae01117485c484970
MD5 SHA1 SHA512

Score

10^/10

remcos host persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

lovelead.ydns.eu:7743

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
EXCEL .exe
copy_folder
remcos
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_dbjxqhkfwhvksow
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title

Signatures

Modifies system executable filetype association 2 TTPs 1 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1042

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	df8c0ae70c93c86d36fa7a2aa827c4ad.exe

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

Executes dropped EXE 2 IoCs

pid	Process
2400	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
2676	EXCEL .exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\	EXCEL .exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\EXCEL .exe\""	EXCEL .exe
Key created	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\EXCEL .exe\""	df8c0ae70c93c86d36fa7a2aa827c4ad.exe

Drops file in Program Files directory 55 IoCs

description	ioc	Process
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\plug_ins\PI_BRO~1\32BITM~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Adobe\ARM\1.0\armsvc.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOOGLE~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\LOGTRA~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\plug_ins\PI_BRO~1\64BITM~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmplayer.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{EF6B0~1\VCREDI~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ADOBEC~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\Browser\WCCHRO~1\WCCHRO~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Adobe\ARM\1.0\ADOBEA~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\setup_wm.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmprph.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Java\JAVAUP~1\jusched.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GO664E~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmlaunch.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\AcroRd32.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\READER~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI8A19~1\ImagingDevices.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Java\JAVAUP~1\jucheck.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{F4220~1\VC_RED~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\arh.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ielowutil.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\wabmig.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ACROTE~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOOGLE~2.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~3\PACKAG~1\{CA675~1\VCREDI~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\FULLTR~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\VSTO\10.0\VSTOIN~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOOGLE~3.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\AcroCEF\RdrCEF.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ExtExport.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOBD5D~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\DISABL~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\INTERN~1\ieinstal.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\MAINTE~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WINDOW~4\ACCESS~1\wordpad.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\WOW_HE~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Adobe\ARM\1.0\AdobeARM.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\Java\JAVAUP~1\jaureg.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\COMMON~1\MICROS~1\MSInfo\msinfo32.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\WinMail.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ACROBR~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOOGLE~4.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~3\Adobe\Setup\{AC76B~1\setup.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~3\MICROS~1\CLICKT~1\{9AC08~1\INTEGR~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmpshare.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\INTERN~1\iexplore.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\MOZILL~1\UNINST~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WINDOW~2\wab.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\ADelRCP.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Adobe\ACROBA~1\Reader\Eula.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Temp\GUM1CBD.tmp\GOFB2B~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOF5E2~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\Google\Update\1335~1.452\GOFB2B~1.EXE	df8c0ae70c93c86d36fa7a2aa827c4ad.exe
File opened for modification	C:\PROGRA~2\WI54FB~1\wmpconfig.exe	df8c0ae70c93c86d36fa7a2aa827c4ad.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\svchost.com	df8c0ae70c93c86d36fa7a2aa827c4ad.exe

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\svchost.com \"%1\" %*"	df8c0ae70c93c86d36fa7a2aa827c4ad.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
184	PING.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2676	EXCEL .exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3944 wrote to memory of 2400	3944	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	75
PID 3944 wrote to memory of 2400	3944	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	75
PID 3944 wrote to memory of 2400	3944	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	75
PID 2400 wrote to memory of 2848	2400	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	76
PID 2400 wrote to memory of 2848	2400	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	76
PID 2400 wrote to memory of 2848	2400	df8c0ae70c93c86d36fa7a2aa827c4ad.exe	76
PID 2848 wrote to memory of 184	2848	cmd.exe	78
PID 2848 wrote to memory of 184	2848	cmd.exe	78
PID 2848 wrote to memory of 184	2848	cmd.exe	78
PID 2848 wrote to memory of 2676	2848	cmd.exe	80
PID 2848 wrote to memory of 2676	2848	cmd.exe	80
PID 2848 wrote to memory of 2676	2848	cmd.exe	80

C:\Users\Admin\AppData\Local\Temp\df8c0ae70c93c86d36fa7a2aa827c4ad.exe
"C:\Users\Admin\AppData\Local\Temp\df8c0ae70c93c86d36fa7a2aa827c4ad.exe"
1⤵
- Modifies system executable filetype association
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3944
- C:\Users\Admin\AppData\Local\Temp\3582-490\df8c0ae70c93c86d36fa7a2aa827c4ad.exe
  "C:\Users\Admin\AppData\Local\Temp\3582-490\df8c0ae70c93c86d36fa7a2aa827c4ad.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:2400
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2848
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      Runs ping.exe
      PID:184
  - - C:\Users\Admin\AppData\Roaming\remcos\EXCEL .exe
      "C:\Users\Admin\AppData\Roaming\remcos\EXCEL .exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetWindowsHookEx
      PID:2676

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Change Default File Association

T1042

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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