dcrat | 85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04/12/2024, 12:51

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General

Target
3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Size 1.3MB
Sample241204-p3gx6awkbv
SHA256 85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080
MD5 3e30bd01f2053ee82162f5eca0faefe8
SHA1 e5859be6a67c8d33a34707df9c13c8ddce6cc690
SHA512 ede7e3f18f0add3744b64955744067654a147e2f4dc33d7d4b9e82d02c7698ea3654ea4623a424729f1e6528314049e102aa2f74b223b16638276e758c5bb9e5
SSDEEP 24576:A3HWfVXWNnnOtB3c20/vtKMpw7fuWppvKoxdO3zFuI:g2fWnnwa2qhcN/5xM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat evasion infostealer rat trojan

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	5004	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2556	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1292	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	900	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1528	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	904	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1368	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4676	4504	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4404	4504	schtasks.exe	83

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2624-1-0x00000000002A0000-0x00000000003EA000-memory.dmp	dcrat
behavioral2/files/0x0007000000023c9c-21.dat	dcrat

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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	dwm.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	3E30BD01F2053EE82162F5ECA0FAEFE8.exe

Executes dropped EXE 1 IoCs

pid	Process
2704	dwm.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe

Looks up external IP address via web service 4 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
21	ipinfo.io
22	ipinfo.io
54	ip-api.com
6	ip-api.com

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Security\BrowserCore\dwm.exe	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
File created	C:\Program Files\Windows Security\BrowserCore\6cb0b6c459d5d3	3E30BD01F2053EE82162F5ECA0FAEFE8.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	dwm.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
1368	schtasks.exe
4404	schtasks.exe
5004	schtasks.exe
1292	schtasks.exe
1528	schtasks.exe
4676	schtasks.exe
2556	schtasks.exe
900	schtasks.exe
904	schtasks.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe
2704	dwm.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2704	dwm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Token: SeDebugPrivilege	2704	dwm.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 2704	2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe	93
PID 2624 wrote to memory of 2704	2624	3E30BD01F2053EE82162F5ECA0FAEFE8.exe	93
PID 2704 wrote to memory of 1656	2704	dwm.exe	94
PID 2704 wrote to memory of 1656	2704	dwm.exe	94
PID 2704 wrote to memory of 3824	2704	dwm.exe	95
PID 2704 wrote to memory of 3824	2704	dwm.exe	95

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	dwm.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	3E30BD01F2053EE82162F5ECA0FAEFE8.exe

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\3E30BD01F2053EE82162F5ECA0FAEFE8.exe
"C:\Users\Admin\AppData\Local\Temp\3E30BD01F2053EE82162F5ECA0FAEFE8.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2624
- C:\Program Files\Windows Security\BrowserCore\dwm.exe
  "C:\Program Files\Windows Security\BrowserCore\dwm.exe"
  2⤵
  - UAC bypass
  - Checks computer location settings
  - Executes dropped EXE
  - Checks whether UAC is enabled
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:2704
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\b3166909-f0e0-4786-8213-8ca2b52bfd42.vbs"
    3⤵
    PID:1656
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\f5c50d03-a4b4-41e0-96a3-cbeb14de1ad1.vbs"
    3⤵
    PID:3824

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 7 /tr "'C:\Users\Admin\PrintHood\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5004

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Users\Admin\PrintHood\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\PrintHood\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\ssh\StartMenuExperienceHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Users\All Users\ssh\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 6 /tr "'C:\Users\All Users\ssh\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:904

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Security\BrowserCore\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1368

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Security\BrowserCore\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4404

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

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

dwm.exe

Path C:\Program Files\Windows Security\BrowserCore\dwm.exe
Size 1.3MB
SHA256 85768ff86e86155faadff2443ea1c9656fc479ffa5f0ae90c9b738bf31ff1080
MD5 3e30bd01f2053ee82162f5eca0faefe8
SHA1 e5859be6a67c8d33a34707df9c13c8ddce6cc690
SHA512 ede7e3f18f0add3744b64955744067654a147e2f4dc33d7d4b9e82d02c7698ea3654ea4623a424729f1e6528314049e102aa2f74b223b16638276e758c5bb9e5
SSDEEP 24576:A3HWfVXWNnnOtB3c20/vtKMpw7fuWppvKoxdO3zFuI:g2fWnnwa2qhcN/5xM
MD5 SHA1 SHA512 SSDEEP

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b3166909-f0e0-4786-8213-8ca2b52bfd42.vbs

Path C:\Users\Admin\AppData\Local\Temp\b3166909-f0e0-4786-8213-8ca2b52bfd42.vbs
Size 729B
SHA256 649c3b981d9c580664642cedbed90356c97ce09cc26ce7ce74cffef10b8e80a5
MD5 9aaf551abe603ad9503989ce6eb60409
SHA1 58a0650296ffca973624eee4b9794e541f5d41b0
SHA512 1450008b0764d14b5f6d8e2c3f13e47d1491c11ee648a5bc23d605aa6e682ad45bcd800ed992bec70b24969265af59bf5ea93f988b450f9df2ca723770c86d7f
MD5 SHA1 SHA512

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f5c50d03-a4b4-41e0-96a3-cbeb14de1ad1.vbs

Path C:\Users\Admin\AppData\Local\Temp\f5c50d03-a4b4-41e0-96a3-cbeb14de1ad1.vbs
Size 505B
SHA256 b04fa2a9f23cb712f16a6d244458ebfad359eced471e680b7d9fb67765745fab
MD5 b5217ffdb100c1bdc57833221752b75b
SHA1 deca9bd70d276fe22c67bf4413171057844c0db0
SHA512 d50cce39574732bee3a2a4046e3c729e2a0a5ad22f1db3abade2e79dc8f15a8788450148bd843e0f11386d18cfa2b6aa563bad58308684ea810ca5996af8b7b2
MD5 SHA1 SHA512

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memory/2624-10-0x000000001AF80000-0x000000001AF8A000-memory.dmp

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memory/2624-11-0x000000001AF90000-0x000000001AF9E000-memory.dmp

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memory/2624-5-0x000000001AF30000-0x000000001AF38000-memory.dmp

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memory/2624-6-0x000000001AF40000-0x000000001AF48000-memory.dmp

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memory/2624-7-0x000000001AF50000-0x000000001AF5A000-memory.dmp

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memory/2624-8-0x000000001AF60000-0x000000001AF6C000-memory.dmp

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memory/2624-9-0x000000001AF70000-0x000000001AF7C000-memory.dmp

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memory/2624-0-0x00007FFD0C0D3000-0x00007FFD0C0D5000-memory.dmp

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memory/2624-12-0x000000001AFA0000-0x000000001AFAE000-memory.dmp

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memory/2624-4-0x0000000002510000-0x000000000251E000-memory.dmp

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memory/2624-13-0x000000001AFB0000-0x000000001AFB8000-memory.dmp

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memory/2624-3-0x0000000002500000-0x000000000250E000-memory.dmp

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memory/2624-31-0x00007FFD0C0D0000-0x00007FFD0CB91000-memory.dmp

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memory/2624-2-0x00007FFD0C0D0000-0x00007FFD0CB91000-memory.dmp

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memory/2624-1-0x00000000002A0000-0x00000000003EA000-memory.dmp

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memory/2704-41-0x000000001D0B0000-0x000000001D272000-memory.dmp

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memory/2704-42-0x000000001DBB0000-0x000000001E0D8000-memory.dmp

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