remcos | 3c64ed631aa34dd243e321f39a0ad5ea40db7ad94152ce97e48c43bb52ed9fbd

Analysis

max time kernel
149s
max time network
142s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-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

Deletes itself 1 IoCs

pid	Process
2292	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2404	winupd205.exe

Loads dropped DLL 2 IoCs

pid	Process
2316	cmd.exe
2316	cmd.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\""	iexplore.exe
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

Drops file in System32 directory 2 IoCs

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

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2404 set thread context of 2784	2404	winupd205.exe	34
PID 2784 set thread context of 2192	2784	iexplore.exe	35

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

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2404	winupd205.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 2304 wrote to memory of 2292	2304	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	30
PID 2304 wrote to memory of 2292	2304	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	30
PID 2304 wrote to memory of 2292	2304	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	30
PID 2304 wrote to memory of 2292	2304	d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe	30
PID 2292 wrote to memory of 2316	2292	WScript.exe	31
PID 2292 wrote to memory of 2316	2292	WScript.exe	31
PID 2292 wrote to memory of 2316	2292	WScript.exe	31
PID 2292 wrote to memory of 2316	2292	WScript.exe	31
PID 2316 wrote to memory of 2404	2316	cmd.exe	33
PID 2316 wrote to memory of 2404	2316	cmd.exe	33
PID 2316 wrote to memory of 2404	2316	cmd.exe	33
PID 2316 wrote to memory of 2404	2316	cmd.exe	33
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2404 wrote to memory of 2784	2404	winupd205.exe	34
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35
PID 2784 wrote to memory of 2192	2784	iexplore.exe	35

C:\Users\Admin\AppData\Local\Temp\d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\d4cbf28eb47bd63c8259f6a229a37d8a_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2304
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2292
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\winupd205.exe"
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2316
  - - 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:2404
    - - 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:2784
      - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        6⤵
        
        PID:2192

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

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
\Windows\SysWOW64\winupd205.exe

Filesize
120KB

MD5
d4cbf28eb47bd63c8259f6a229a37d8a

SHA1
c055580e85324a771369fb8f68aa6883f9b8893c

SHA256
3c64ed631aa34dd243e321f39a0ad5ea40db7ad94152ce97e48c43bb52ed9fbd

SHA512
79ce83edc584c2f99fd552e56ac0ae480b839292ed12e2e260d98c19d824f937d703ec285b2fa370c7a7b92b299fc790b114e42fd09a4c9645f062248db5de3b

Download Submit
memory/2192-24-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-23-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2192-21-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-19-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-17-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-15-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-13-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2192-11-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2784-10-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download