remcos | 00d52b668be725580bf1233a8bc805f62831f96ca8f7cf50807cd3481727981a

Analysis

max time kernel
151s
max time network
153s
platform
windows10_x64
resource
win10v20210408
submitted
29/07/2021, 11:42

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General

Target
RA1_20210729.exe
Size 1.5MB
Sample210729-dxt3wh32js
SHA256 00d52b668be725580bf1233a8bc805f62831f96ca8f7cf50807cd3481727981a
MD5 8c6310883496c8b128afb34a4c922554
SHA1 1f5fa188d9e0ea6f3dbf138b14b3af8cea21b968
SHA512 18132791203e26363b399cd03ee79a158754581d2f23b64f30eb3df4e2395e23be8447774af07a4f8ceff39e2b2518b0fdc2bb696a1b4c1c807dc8ddab06beb5
MD5 SHA1 SHA512

Score

10^/10

remcos sa persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Version

3.1.5 Pro

Botnet

ego.ddns.net:2404
chasesure.duckdns.org:2404

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
rem.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-6KPFIK
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

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

CustAttr .NET packer 1 IoCs

Detects CustAttr .NET packer in memory.

resource	yara_rule
behavioral2/memory/3008-121-0x0000000005A30000-0x0000000005A3B000-memory.dmp	CustAttr

Executes dropped EXE 4 IoCs

pid	Process
2732	rem.exe
3016	rem.exe
4032	rem.exe
1332	rem.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-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	RA1_20210729.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\rem.exe\""	RA1_20210729.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	rem.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\rem.exe\""	rem.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3008 set thread context of 3820	3008	RA1_20210729.exe	81
PID 2732 set thread context of 1332	2732	rem.exe	90

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
2116	schtasks.exe
2188	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	RA1_20210729.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3008	RA1_20210729.exe
3008	RA1_20210729.exe
2732	rem.exe
2732	rem.exe
2732	rem.exe
2732	rem.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3008	RA1_20210729.exe
Token: SeDebugPrivilege	2732	rem.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1332	rem.exe

Suspicious use of WriteProcessMemory 48 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 2116	3008	RA1_20210729.exe	78
PID 3008 wrote to memory of 2116	3008	RA1_20210729.exe	78
PID 3008 wrote to memory of 2116	3008	RA1_20210729.exe	78
PID 3008 wrote to memory of 3952	3008	RA1_20210729.exe	80
PID 3008 wrote to memory of 3952	3008	RA1_20210729.exe	80
PID 3008 wrote to memory of 3952	3008	RA1_20210729.exe	80
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3008 wrote to memory of 3820	3008	RA1_20210729.exe	81
PID 3820 wrote to memory of 3044	3820	RA1_20210729.exe	82
PID 3820 wrote to memory of 3044	3820	RA1_20210729.exe	82
PID 3820 wrote to memory of 3044	3820	RA1_20210729.exe	82
PID 3044 wrote to memory of 4016	3044	WScript.exe	83
PID 3044 wrote to memory of 4016	3044	WScript.exe	83
PID 3044 wrote to memory of 4016	3044	WScript.exe	83
PID 4016 wrote to memory of 2732	4016	cmd.exe	85
PID 4016 wrote to memory of 2732	4016	cmd.exe	85
PID 4016 wrote to memory of 2732	4016	cmd.exe	85
PID 2732 wrote to memory of 2188	2732	rem.exe	86
PID 2732 wrote to memory of 2188	2732	rem.exe	86
PID 2732 wrote to memory of 2188	2732	rem.exe	86
PID 2732 wrote to memory of 3016	2732	rem.exe	88
PID 2732 wrote to memory of 3016	2732	rem.exe	88
PID 2732 wrote to memory of 3016	2732	rem.exe	88
PID 2732 wrote to memory of 4032	2732	rem.exe	89
PID 2732 wrote to memory of 4032	2732	rem.exe	89
PID 2732 wrote to memory of 4032	2732	rem.exe	89
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90
PID 2732 wrote to memory of 1332	2732	rem.exe	90

C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe
"C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3008
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\WfduhSfoZwnp" /XML "C:\Users\Admin\AppData\Local\Temp\tmp1C43.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:2116
- C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe
  "C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe"
  2⤵
  PID:3952
- C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe
  "C:\Users\Admin\AppData\Local\Temp\RA1_20210729.exe"
  2⤵
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:3820
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3044
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\rem.exe"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4016
    - - C:\Users\Admin\AppData\Roaming\Remcos\rem.exe
        
        C:\Users\Admin\AppData\Roaming\Remcos\rem.exe
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2732
      - C:\Windows\SysWOW64\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\WfduhSfoZwnp" /XML "C:\Users\Admin\AppData\Local\Temp\tmpED8D.tmp"
        6⤵
        Creates scheduled task(s)
        
        PID:2188
      - C:\Users\Admin\AppData\Roaming\Remcos\rem.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\rem.exe"
        6⤵
        Executes dropped EXE
        
        PID:3016
      - C:\Users\Admin\AppData\Roaming\Remcos\rem.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\rem.exe"
        6⤵
        Executes dropped EXE
        
        PID:4032
      - C:\Users\Admin\AppData\Roaming\Remcos\rem.exe
        
        "C:\Users\Admin\AppData\Roaming\Remcos\rem.exe"
        6⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:1332

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1332-152-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/2732-141-0x0000000002520000-0x0000000002521000-memory.dmp

Download

memory/3008-122-0x00000000069A0000-0x0000000006A6F000-memory.dmp

Download

memory/3008-119-0x0000000005930000-0x0000000005931000-memory.dmp

Download

memory/3008-116-0x0000000005F90000-0x0000000005F91000-memory.dmp

Download

memory/3008-117-0x0000000005980000-0x0000000005981000-memory.dmp

Download

memory/3008-118-0x0000000005A90000-0x0000000005F8E000-memory.dmp

Download

memory/3008-120-0x0000000005C80000-0x0000000005C81000-memory.dmp

Download

memory/3008-123-0x0000000008E30000-0x0000000008EA3000-memory.dmp

Download

memory/3008-114-0x0000000000E50000-0x0000000000E51000-memory.dmp

Download

memory/3008-121-0x0000000005A30000-0x0000000005A3B000-memory.dmp

Download

memory/3820-126-0x0000000000400000-0x0000000000479000-memory.dmp

Download

memory/3820-128-0x0000000000400000-0x0000000000479000-memory.dmp

Download