remcos | 3c64ed631aa34dd243e321f39a0ad5ea40db7ad94152ce97e48c43bb52ed9fbd

Analysis

max time kernel
149s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
08-09-2024 16:35

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General

Target

d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
Size

120KB
MD5

d4cbf28eb47bd63c8259f6a229a37d8a
SHA1

c055580e85324a771369fb8f68aa6883f9b8893c
SHA256

3c64ed631aa34dd243e321f39a0ad5ea40db7ad94152ce97e48c43bb52ed9fbd
SHA512

79ce83edc584c2f99fd552e56ac0ae480b839292ed12e2e260d98c19d824f937d703ec285b2fa370c7a7b92b299fc790b114e42fd09a4c9645f062248db5de3b
SSDEEP

3072:JFNUcekHxRkuHxSWMDUajQJf/p/itxBCBpEzImXnr+vHI+zIcdv2u1p:JHUcLxRkuRSWMDUaGf/p/sxWpEzImXqr

Score

10^/10

remcos stealthkeep_v205 discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

2.0.5 Pro

Botnet

StealthKeep_v205

google.airdns.org:2297

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
winupd205.exe
delete_file
true
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
winupd205-WYQAIF
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
scrshots
screenshot_path
%UserProfile%
screenshot_time
10
startup_value
winupd205
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat 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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
4568	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2868	winupd205.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\winupd205 = "\"C:\\Windows\\SysWOW64\\winupd205.exe\""	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\winupd205 = "\"C:\\Windows\\SysWOW64\\winupd205.exe\""	winupd205.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\winupd205 = "\"C:\\Windows\\SysWOW64\\winupd205.exe\""	iexplore.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\winupd205.exe	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\winupd205.exe	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2868 set thread context of 4480	2868	winupd205.exe	90
PID 4480 set thread context of 1532	4480	iexplore.exe	91

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 5 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	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
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	winupd205.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000_Classes\Local Settings	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2868	winupd205.exe
2868	winupd205.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 4992 wrote to memory of 4568	4992	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	84
PID 4992 wrote to memory of 4568	4992	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	84
PID 4992 wrote to memory of 4568	4992	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	84
PID 4568 wrote to memory of 4468	4568	WScript.exe	87
PID 4568 wrote to memory of 4468	4568	WScript.exe	87
PID 4568 wrote to memory of 4468	4568	WScript.exe	87
PID 4468 wrote to memory of 2868	4468	cmd.exe	89
PID 4468 wrote to memory of 2868	4468	cmd.exe	89
PID 4468 wrote to memory of 2868	4468	cmd.exe	89
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 2868 wrote to memory of 4480	2868	winupd205.exe	90
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91
PID 4480 wrote to memory of 1532	4480	iexplore.exe	91

C:\Users\Admin\AppData\Local\Temp\d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4992
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4568
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\winupd205.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4468
  - - C:\Windows\SysWOW64\winupd205.exe
      C:\Windows\SysWOW64\winupd205.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:2868
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        5⤵
        Adds Run key to start application
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:4480
      - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        6⤵
        
        PID:1532

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
592B

MD5
5ea41b9a5466c5e399b6ea3f82d671b6

SHA1
c083afa5de3b9bbf2cc9c3470445e2c2f956c27d

SHA256
2301ee70d70463ee7fbe4766f0203c46b8680c8914980e04f68a77ecedc73e16

SHA512
a676adf5bb1f913317e9f3cb1e022b901e960994d2e5b8795e872c624cc172f28c1d8591f68f0ec48c496a29e041c6a194b815bdf5a2a4a76a0ef7d2f5b6ad1a

Download Submit
C:\Windows\SysWOW64\winupd205.exe

Filesize
120KB

MD5
d4cbf28eb47bd63c8259f6a229a37d8a

SHA1
c055580e85324a771369fb8f68aa6883f9b8893c

SHA256
3c64ed631aa34dd243e321f39a0ad5ea40db7ad94152ce97e48c43bb52ed9fbd

SHA512
79ce83edc584c2f99fd552e56ac0ae480b839292ed12e2e260d98c19d824f937d703ec285b2fa370c7a7b92b299fc790b114e42fd09a4c9645f062248db5de3b

Download Submit
memory/1532-10-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1532-13-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4480-9-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download