dcrat | 101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22/12/2024, 10:27

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General

Target

JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe
Size

1.3MB
MD5

b9b18503dc7bd372e5ea3de0b165594d
SHA1

229f4485d6b041a166af262b23a545c38d5088cd
SHA256

101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73
SHA512

0120d60de7ead6a000a564b7c58cb5d9e6c8287aaeeb7458d5b776d4370d12fc245254ab35e6f6e59fec47cda466dd98c43116be4f5790080ec8d14a180b3c81
SSDEEP

24576:U2G/nvxW3Ww0t6TnzGmVBDh4+aknuRRZJND0gFJ4rD/IjC:UbA30GnzV/q+DnsXg

Score

10^/10

dcrat discovery execution infostealer rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Dcrat family
dcrat

Process spawned unexpected child process 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2308	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1776	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1476	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1948	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2404	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	352	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	760	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2860	2656	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2320	2656	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00070000000170b5-11.dat	dcrat
behavioral1/memory/2632-13-0x0000000000970000-0x0000000000A80000-memory.dmp	dcrat
behavioral1/memory/2928-45-0x0000000000F90000-0x00000000010A0000-memory.dmp	dcrat

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2932	powershell.exe
2960	powershell.exe
2972	powershell.exe
2992	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2632	DllCommonsvc.exe
2928	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2908	cmd.exe
2908	cmd.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\IME\IMESC5\applets\dwm.exe	DllCommonsvc.exe
File created	C:\Windows\SysWOW64\IME\IMESC5\applets\6cb0b6c459d5d3	DllCommonsvc.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 3 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	JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2320	schtasks.exe
1476	schtasks.exe
2404	schtasks.exe
352	schtasks.exe
2860	schtasks.exe
2308	schtasks.exe
1776	schtasks.exe
1948	schtasks.exe
760	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2632	DllCommonsvc.exe
2992	powershell.exe
2972	powershell.exe
2960	powershell.exe
2932	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2632	DllCommonsvc.exe
Token: SeDebugPrivilege	2992	powershell.exe
Token: SeDebugPrivilege	2972	powershell.exe
Token: SeDebugPrivilege	2960	powershell.exe
Token: SeDebugPrivilege	2932	powershell.exe
Token: SeDebugPrivilege	2928	csrss.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2096 wrote to memory of 2820	2096	JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe	30
PID 2096 wrote to memory of 2820	2096	JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe	30
PID 2096 wrote to memory of 2820	2096	JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe	30
PID 2096 wrote to memory of 2820	2096	JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe	30
PID 2820 wrote to memory of 2908	2820	WScript.exe	31
PID 2820 wrote to memory of 2908	2820	WScript.exe	31
PID 2820 wrote to memory of 2908	2820	WScript.exe	31
PID 2820 wrote to memory of 2908	2820	WScript.exe	31
PID 2908 wrote to memory of 2632	2908	cmd.exe	33
PID 2908 wrote to memory of 2632	2908	cmd.exe	33
PID 2908 wrote to memory of 2632	2908	cmd.exe	33
PID 2908 wrote to memory of 2632	2908	cmd.exe	33
PID 2632 wrote to memory of 2932	2632	DllCommonsvc.exe	44
PID 2632 wrote to memory of 2932	2632	DllCommonsvc.exe	44
PID 2632 wrote to memory of 2932	2632	DllCommonsvc.exe	44
PID 2632 wrote to memory of 2960	2632	DllCommonsvc.exe	45
PID 2632 wrote to memory of 2960	2632	DllCommonsvc.exe	45
PID 2632 wrote to memory of 2960	2632	DllCommonsvc.exe	45
PID 2632 wrote to memory of 2972	2632	DllCommonsvc.exe	46
PID 2632 wrote to memory of 2972	2632	DllCommonsvc.exe	46
PID 2632 wrote to memory of 2972	2632	DllCommonsvc.exe	46
PID 2632 wrote to memory of 2992	2632	DllCommonsvc.exe	47
PID 2632 wrote to memory of 2992	2632	DllCommonsvc.exe	47
PID 2632 wrote to memory of 2992	2632	DllCommonsvc.exe	47
PID 2632 wrote to memory of 2928	2632	DllCommonsvc.exe	52
PID 2632 wrote to memory of 2928	2632	DllCommonsvc.exe	52
PID 2632 wrote to memory of 2928	2632	DllCommonsvc.exe	52

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_101b39a27d538b0b8fce85576db908557d1adefe8720439d91a20397d8f07e73.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2096
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2820
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\providercommon\1zu9dW.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2908
  - - C:\providercommon\DllCommonsvc.exe
      "C:\providercommon\DllCommonsvc.exe"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2632
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\providercommon\DllCommonsvc.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2932
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2960
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2972
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\SysWOW64\IME\IMESC5\applets\dwm.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2992
    - - C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe
        
        "C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:2928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2308

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Windows\SysWOW64\IME\IMESC5\applets\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\SysWOW64\IME\IMESC5\applets\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 9 /tr "'C:\Windows\SysWOW64\IME\IMESC5\applets\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

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

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
7f3c4511e2ee8b007307f536ccf8427f

SHA1
bb7d313bc6bace4938613f8cb4ebc33ed0fe69fe

SHA256
8896bb490c18e449de2de47744cf6494f144e6076f4c4941af89f825af34d237

SHA512
2b90b70975e89e9e63ddc05ed4e37fde239eb436e2037d071881e916ada53a6cf290871cea2b576397dd77fb2d2996d9be89c4e4f931fd543ae640ddf9c33983

Download Submit
C:\providercommon\1zu9dW.bat

Filesize
36B

MD5
6783c3ee07c7d151ceac57f1f9c8bed7

SHA1
17468f98f95bf504cc1f83c49e49a78526b3ea03

SHA256
8ab782f0f327a2021530e7230d3aee8abbecb7eed59482a3a46e78b9e3862322

SHA512
c6012d4bfac1ed14d0fd9f0eabd0e1c3d647b343db292a907b246271d52a4b7469c809db43910ddba2e8c5045f9cb3d24d0af62d363281e6cb8b39ee94a183e8

Download Submit
C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe

Filesize
197B

MD5
8088241160261560a02c84025d107592

SHA1
083121f7027557570994c9fc211df61730455bb5

SHA256
2072cc9a4a3b84d4c5178ab41c5588eea7d0103e3928e34d64f17bf97f3d1cc1

SHA512
20d9369dd359315848ea30144383a0bb479d86059fdbc3b3256ac84f998193512feb3b1799ab663619920c99fe7e0ebba33ada31a3855094b956fcd351c90478

Download Submit
\providercommon\DllCommonsvc.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
memory/2632-13-0x0000000000970000-0x0000000000A80000-memory.dmp

Filesize
1.1MB

Download
memory/2632-14-0x00000000002C0000-0x00000000002D2000-memory.dmp

Filesize
72KB

Download
memory/2632-15-0x00000000002D0000-0x00000000002DC000-memory.dmp

Filesize
48KB

Download
memory/2632-16-0x00000000002E0000-0x00000000002EC000-memory.dmp

Filesize
48KB

Download
memory/2632-17-0x00000000002F0000-0x00000000002FC000-memory.dmp

Filesize
48KB

Download
memory/2928-45-0x0000000000F90000-0x00000000010A0000-memory.dmp

Filesize
1.1MB

Download
memory/2992-51-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download
memory/2992-44-0x000000001B450000-0x000000001B732000-memory.dmp

Filesize
2.9MB

Download