dcrat | 2b3486f0cf0b084bdf4e634551224cccc6e01fd88b7af00dee3190aa8ebc301e

Analysis

max time kernel
140s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
18/01/2024, 06:41

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General

Target
AE17AED55C0CF4C2D43597852F5686C9.exe
Size 827KB
Sample240118-hfreraedhl
SHA256 2b3486f0cf0b084bdf4e634551224cccc6e01fd88b7af00dee3190aa8ebc301e
MD5 ae17aed55c0cf4c2d43597852f5686c9
SHA1 8119e07b4981053c1a8b654b722c95337691c8de
SHA512 8716e7ff96ca66aef32511553e628659a7d28884e3556c04310318850e9d71b8a1ec36fe27b268dc74bef765f613b910f0083b3204c4722ed31d620732380565
SSDEEP 12288:gwal0usliGLguLgF8e28hmo0zIdS2c/fk3sXax/ho:gl0usligEF8eDMLNn6JxS
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat 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

Process spawned unexpected child process 15 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	4616	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4136	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4272	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4840	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1500	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1116	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1828	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1148	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1296	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3840	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4244	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	684	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4540	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3772	3532	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4388	3532	schtasks.exe	85

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1424-0-0x0000000000AD0000-0x0000000000BA6000-memory.dmp	dcrat
behavioral2/files/0x0006000000023211-11.dat	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-996941297-2279405024-2328152752-1000\Control Panel\International\Geo\Nation	AE17AED55C0CF4C2D43597852F5686C9.exe

Executes dropped EXE 1 IoCs

pid	Process
4596	fontdrvhost.exe

Drops file in Program Files directory 7 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Portable Devices\dllhost.exe	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files (x86)\Windows Portable Devices\5940a34987c991	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files\Google\Chrome\Application\fontdrvhost.exe	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files\Google\Chrome\Application\5b884080fd4f94	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files\WindowsApps\Microsoft.NET.Native.Framework.2.2_2.2.27405.0_x64__8wekyb3d8bbwe\microsoft.system.package.metadata\Autogen\fontdrvhost.exe	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files (x86)\Windows Mail\dllhost.exe	AE17AED55C0CF4C2D43597852F5686C9.exe
File created	C:\Program Files (x86)\Windows Mail\5940a34987c991	AE17AED55C0CF4C2D43597852F5686C9.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 15 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
1296	schtasks.exe
3840	schtasks.exe
3772	schtasks.exe
1500	schtasks.exe
4244	schtasks.exe
684	schtasks.exe
4540	schtasks.exe
4388	schtasks.exe
4272	schtasks.exe
4840	schtasks.exe
1116	schtasks.exe
1828	schtasks.exe
4616	schtasks.exe
4136	schtasks.exe
1148	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-996941297-2279405024-2328152752-1000_Classes\Local Settings	AE17AED55C0CF4C2D43597852F5686C9.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
1424	AE17AED55C0CF4C2D43597852F5686C9.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe
4596	fontdrvhost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4596	fontdrvhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1424	AE17AED55C0CF4C2D43597852F5686C9.exe
Token: SeDebugPrivilege	4596	fontdrvhost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 428	1424	AE17AED55C0CF4C2D43597852F5686C9.exe	103
PID 1424 wrote to memory of 428	1424	AE17AED55C0CF4C2D43597852F5686C9.exe	103
PID 428 wrote to memory of 4748	428	cmd.exe	105
PID 428 wrote to memory of 4748	428	cmd.exe	105
PID 428 wrote to memory of 4596	428	cmd.exe	111
PID 428 wrote to memory of 4596	428	cmd.exe	111

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\AE17AED55C0CF4C2D43597852F5686C9.exe
"C:\Users\Admin\AppData\Local\Temp\AE17AED55C0CF4C2D43597852F5686C9.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1424
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\YrCOkF2Jve.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:428
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4748
- - C:\Program Files\Google\Chrome\Application\fontdrvhost.exe
    "C:\Program Files\Google\Chrome\Application\fontdrvhost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:4596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4136

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\Chrome\Application\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4840

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1500

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Program Files\Google\Chrome\Application\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1116

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\ssh\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\All Users\ssh\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\ssh\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3840

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Portable Devices\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Portable Devices\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4388

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

dllhost.exe

Path C:\Program Files (x86)\Windows Portable Devices\dllhost.exe
Size 827KB
SHA256 2b3486f0cf0b084bdf4e634551224cccc6e01fd88b7af00dee3190aa8ebc301e
MD5 ae17aed55c0cf4c2d43597852f5686c9
SHA1 8119e07b4981053c1a8b654b722c95337691c8de
SHA512 8716e7ff96ca66aef32511553e628659a7d28884e3556c04310318850e9d71b8a1ec36fe27b268dc74bef765f613b910f0083b3204c4722ed31d620732380565
SSDEEP 12288:gwal0usliGLguLgF8e28hmo0zIdS2c/fk3sXax/ho:gl0usligEF8eDMLNn6JxS
MD5 SHA1 SHA512 SSDEEP

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YrCOkF2Jve.bat

Path C:\Users\Admin\AppData\Local\Temp\YrCOkF2Jve.bat
Size 223B
SHA256 4d4e9d12407e28b1bfd5e6d23ceb00a246e8f6fb8249eb603f3fa8105f20a4af
MD5 9e71bdb4788dc94f321fd87fc5e1c269
SHA1 6727b619dca79406dafe72ef0b550b6c6d03f448
SHA512 8aad8fb17cada8ad6769103857634f067ed9e61374f9cd906ce758e6d8c077d5d01b2f52ea4924004f14295de4f5423b8a0ce423f8b01072b77f061bb616043f
MD5 SHA1 SHA512

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memory/1424-0-0x0000000000AD0000-0x0000000000BA6000-memory.dmp

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memory/1424-1-0x00007FFDF7FE0000-0x00007FFDF8AA1000-memory.dmp

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memory/1424-2-0x000000001B9A0000-0x000000001B9B0000-memory.dmp

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memory/1424-19-0x00007FFDF7FE0000-0x00007FFDF8AA1000-memory.dmp

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memory/4596-23-0x00007FFDF6FD0000-0x00007FFDF7A91000-memory.dmp

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memory/4596-24-0x000000001B1C0000-0x000000001B1D0000-memory.dmp

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memory/4596-25-0x00007FFDF6FD0000-0x00007FFDF7A91000-memory.dmp

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memory/4596-26-0x000000001B1C0000-0x000000001B1D0000-memory.dmp

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