dcrat | 486d063b3d47cd17e561a7ebba200fa0bbd3212057bd13294e36cf0e76c062d7

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
02/01/2025, 01:06

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General

Target
688169df79b2edd7a3e3c154177012c0.exe
Size 2.4MB
Sample250102-bf3pfswrhj
SHA256 486d063b3d47cd17e561a7ebba200fa0bbd3212057bd13294e36cf0e76c062d7
MD5 688169df79b2edd7a3e3c154177012c0
SHA1 deee392f0676d1b86763421a11ed574dfa344ae3
SHA512 d0b8ec4c6c12dc9b1803653d73d5e129fd8783b4a60cfa0a797703a4ca834e521f415f31af2c91717bff89ac61b6234058ab3cabbb1539b660855eb904d578b3
SSDEEP 24576:M2G/nvxW3WcFDPvgpYEgL6aL2UPwqfm8b2diBT4qhB0WeyYAmmdISxCndhaUmbK+:MbA3vyYEaKCTBBkJmOQealLg1/+LNxp
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat discovery 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 6 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	2548	1248	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1852	1248	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2012	1248	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2604	1248	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	568	1248	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2656	1248	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016846-14.dat	dcrat
behavioral1/memory/2692-18-0x0000000000AE0000-0x0000000000D04000-memory.dmp	dcrat
behavioral1/memory/3060-34-0x0000000000B00000-0x0000000000D24000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2692	Comserver.exe
3060	Comserver.exe

Loads dropped DLL 2 IoCs

pid	Process
2948	cmd.exe
2948	cmd.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe	Comserver.exe
File opened for modification	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe	Comserver.exe
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\ab69584b909429	Comserver.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 4 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	688169df79b2edd7a3e3c154177012c0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.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 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2548	schtasks.exe
1852	schtasks.exe
2012	schtasks.exe
2604	schtasks.exe
568	schtasks.exe
2656	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2692	Comserver.exe
3060	Comserver.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2692	Comserver.exe
Token: SeDebugPrivilege	3060	Comserver.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2884 wrote to memory of 2316	2884	688169df79b2edd7a3e3c154177012c0.exe	30
PID 2884 wrote to memory of 2316	2884	688169df79b2edd7a3e3c154177012c0.exe	30
PID 2884 wrote to memory of 2316	2884	688169df79b2edd7a3e3c154177012c0.exe	30
PID 2884 wrote to memory of 2316	2884	688169df79b2edd7a3e3c154177012c0.exe	30
PID 2884 wrote to memory of 2796	2884	688169df79b2edd7a3e3c154177012c0.exe	31
PID 2884 wrote to memory of 2796	2884	688169df79b2edd7a3e3c154177012c0.exe	31
PID 2884 wrote to memory of 2796	2884	688169df79b2edd7a3e3c154177012c0.exe	31
PID 2884 wrote to memory of 2796	2884	688169df79b2edd7a3e3c154177012c0.exe	31
PID 2316 wrote to memory of 2948	2316	WScript.exe	32
PID 2316 wrote to memory of 2948	2316	WScript.exe	32
PID 2316 wrote to memory of 2948	2316	WScript.exe	32
PID 2316 wrote to memory of 2948	2316	WScript.exe	32
PID 2948 wrote to memory of 2692	2948	cmd.exe	34
PID 2948 wrote to memory of 2692	2948	cmd.exe	34
PID 2948 wrote to memory of 2692	2948	cmd.exe	34
PID 2948 wrote to memory of 2692	2948	cmd.exe	34
PID 2692 wrote to memory of 3012	2692	Comserver.exe	42
PID 2692 wrote to memory of 3012	2692	Comserver.exe	42
PID 2692 wrote to memory of 3012	2692	Comserver.exe	42
PID 3012 wrote to memory of 2984	3012	cmd.exe	44
PID 3012 wrote to memory of 2984	3012	cmd.exe	44
PID 3012 wrote to memory of 2984	3012	cmd.exe	44
PID 3012 wrote to memory of 3060	3012	cmd.exe	45
PID 3012 wrote to memory of 3060	3012	cmd.exe	45
PID 3012 wrote to memory of 3060	3012	cmd.exe	45

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\688169df79b2edd7a3e3c154177012c0.exe
"C:\Users\Admin\AppData\Local\Temp\688169df79b2edd7a3e3c154177012c0.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2884
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontDll\fe8pRFyRbXbMmhAeUdD.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2316
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\FontDll\QLqJH9vBkenIEb.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2948
  - - C:\FontDll\Comserver.exe
      "C:\FontDll\Comserver.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2692
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\KHyslkFIOf.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3012
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2984
      - C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe
        
        "C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3060
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\FontDll\file.vbs"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "ComserverC" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Comserver" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "ComserverC" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\Comserver.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 8 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 5 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

QLqJH9vBkenIEb.bat

Path C:\FontDll\QLqJH9vBkenIEb.bat
Size 26B
SHA256 6be168e75b3836a0de3d28c86598851ec65a4ae13d6b614c4e092fc37feaa339
MD5 63a2bdfc7f8a8cefda193948d275dbe6
SHA1 5e37ea1b3ad9b4aa467287538602af7d8c41a87f
SHA512 a3fc9c23087950bca440f4ab5b128c2493f20badf0e94439260eed43a47384683d703d3bc35b94effdf2be9888708d63f54112484a8437b05f6977478001ccf8
MD5 SHA1 SHA512

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fe8pRFyRbXbMmhAeUdD.vbe

Path C:\FontDll\fe8pRFyRbXbMmhAeUdD.vbe
Size 198B
SHA256 17c5436f31c1716444d1e656f741956dc601b91161abfcd23ddc57b6996d6a57
MD5 99583f385f11a037b557d9ef45a3488d
SHA1 3f72c815265a238ca9992b05aca94e54f734e650
SHA512 6b3d9db138058cd13bbab2e96ee36ed192656650cc1c73baae07dab237eced9e5fac2e70e9177e9b861773cc50756ea43011269054c22d9e22bd051af5caaf65
MD5 SHA1 SHA512

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file.vbs

Path C:\FontDll\file.vbs
Size 34B
SHA256 f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b
MD5 677cc4360477c72cb0ce00406a949c61
SHA1 b679e8c3427f6c5fc47c8ac46cd0e56c9424de05
SHA512 7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a
MD5 SHA1 SHA512

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KHyslkFIOf.bat

Path C:\Users\Admin\AppData\Local\Temp\KHyslkFIOf.bat
Size 249B
SHA256 78ae41d87e957b07ee43476a574c0ed356357c84259cf59c640debeaa2c39dc3
MD5 1f7cf94a44041dfaf5ca6b0e5738e298
SHA1 dab2b4cb49e6d6da1e5b710ccdc75f0c01938791
SHA512 7f574b0a39b6f4a3470524398b547fda18fd2c162fd1185daf276c57654ffb03931e99632d31b3d653cfdb5c8053856681678e117322c1845781ce8f46dc026d
MD5 SHA1 SHA512

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Comserver.exe

Path \FontDll\Comserver.exe
Size 2.1MB
SHA256 8143ab6b11bd194875aa96b694dfe569ed0158dc6b00f1c68f99a618682cc380
MD5 69e28c3b296161aa3a3958321f9e7960
SHA1 4755951625cdfed9c9dcd50859378dfbb94ffa79
SHA512 ecbce7438851dec93e70a15eb87b1dce20cb9adf4502e0b92eacf21fbe220db44b1b5619e6217e0ea6c0232fe3e4ac70fe9428061d59c921b97e80af85985bbb
SSDEEP 24576:vpYEgL6aL2UPwqfm8b2diBT4qhB0WeyYAmmdISxCndhaUmbKafYGWJ8c/V8RLNx8:RYEaKCTBBkJmOQealLg1/+LNx
MD5 SHA1 SHA512 SSDEEP

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memory/2692-18-0x0000000000AE0000-0x0000000000D04000-memory.dmp

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memory/2692-19-0x0000000000240000-0x000000000025C000-memory.dmp

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memory/2692-20-0x0000000000400000-0x0000000000416000-memory.dmp

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memory/2692-21-0x0000000002220000-0x0000000002276000-memory.dmp

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memory/2692-22-0x0000000000270000-0x0000000000278000-memory.dmp

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memory/3060-34-0x0000000000B00000-0x0000000000D24000-memory.dmp

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