dcrat | f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
26/05/2024, 23:31

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General

Target
1a72ad3d430f9a080a432f48ebe3be5c.exe
Size 2.3MB
Sample240526-3hpddsga8v
SHA256 f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376
MD5 1a72ad3d430f9a080a432f48ebe3be5c
SHA1 184222dcb4a05f1c11ca3bf9ac8697eca6d3cc76
SHA512 cd4a7747179e10d83ac42cfc280dcd81a61cf1c2914a7b4607b734fe76a83e0388df0c1112354cd08068f4dfe3c9e375a918113ebe03e7eccce1759caddc6439
SSDEEP 49152:ThKinMhilIRoMIU2QRzKa/Au5ByyhveVp4fX:FKcMhikzIUXRx93hGgX
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	3464	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2512	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2864	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1176	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4612	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3644	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2980	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4528	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3276	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	736	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4324	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4656	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	640	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4176	5016	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4156	5016	schtasks.exe	82

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/2744-1-0x0000000000A70000-0x0000000000CC2000-memory.dmp	dcrat
behavioral2/files/0x00070000000233d5-20.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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	1a72ad3d430f9a080a432f48ebe3be5c.exe

Executes dropped EXE 1 IoCs

pid	Process
3828	backgroundTaskHost.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
18	pastebin.com
19	pastebin.com

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Program Files\Windows Portable Devices\eddb19405b7ce1	1a72ad3d430f9a080a432f48ebe3be5c.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\TAPI\csrss.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Windows\TAPI\886983d96e3d3e	1a72ad3d430f9a080a432f48ebe3be5c.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
2864	schtasks.exe
2980	schtasks.exe
736	schtasks.exe
4176	schtasks.exe
3464	schtasks.exe
4612	schtasks.exe
4156	schtasks.exe
1176	schtasks.exe
3644	schtasks.exe
4528	schtasks.exe
4324	schtasks.exe
4656	schtasks.exe
2512	schtasks.exe
3276	schtasks.exe
640	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	1a72ad3d430f9a080a432f48ebe3be5c.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2744	1a72ad3d430f9a080a432f48ebe3be5c.exe
2744	1a72ad3d430f9a080a432f48ebe3be5c.exe
2744	1a72ad3d430f9a080a432f48ebe3be5c.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe
3828	backgroundTaskHost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3828	backgroundTaskHost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2744	1a72ad3d430f9a080a432f48ebe3be5c.exe
Token: SeDebugPrivilege	3828	backgroundTaskHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2744 wrote to memory of 2168	2744	1a72ad3d430f9a080a432f48ebe3be5c.exe	98
PID 2744 wrote to memory of 2168	2744	1a72ad3d430f9a080a432f48ebe3be5c.exe	98
PID 2168 wrote to memory of 404	2168	cmd.exe	100
PID 2168 wrote to memory of 404	2168	cmd.exe	100
PID 2168 wrote to memory of 3828	2168	cmd.exe	104
PID 2168 wrote to memory of 3828	2168	cmd.exe	104

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\1a72ad3d430f9a080a432f48ebe3be5c.exe
"C:\Users\Admin\AppData\Local\Temp\1a72ad3d430f9a080a432f48ebe3be5c.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2744
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\YK3UMRZZSL.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2168
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:404
- - C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe
    "C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:3828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 7 /tr "'C:\Users\Admin\Pictures\Saved Pictures\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3464

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Users\Admin\Pictures\Saved Pictures\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\Pictures\Saved Pictures\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Windows\TAPI\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\TAPI\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Windows\TAPI\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Portable Devices\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "1a72ad3d430f9a080a432f48ebe3be5c1" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\1a72ad3d430f9a080a432f48ebe3be5c.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "1a72ad3d430f9a080a432f48ebe3be5c" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\1a72ad3d430f9a080a432f48ebe3be5c.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "1a72ad3d430f9a080a432f48ebe3be5c1" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\1a72ad3d430f9a080a432f48ebe3be5c.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4156

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

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

taskhostw.exe

Path C:\Recovery\WindowsRE\taskhostw.exe
Size 2.3MB
SHA256 f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376
MD5 1a72ad3d430f9a080a432f48ebe3be5c
SHA1 184222dcb4a05f1c11ca3bf9ac8697eca6d3cc76
SHA512 cd4a7747179e10d83ac42cfc280dcd81a61cf1c2914a7b4607b734fe76a83e0388df0c1112354cd08068f4dfe3c9e375a918113ebe03e7eccce1759caddc6439
SSDEEP 49152:ThKinMhilIRoMIU2QRzKa/Au5ByyhveVp4fX:FKcMhikzIUXRx93hGgX
MD5 SHA1 SHA512 SSDEEP

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YK3UMRZZSL.bat

Path C:\Users\Admin\AppData\Local\Temp\YK3UMRZZSL.bat
Size 229B
SHA256 76d7392cf408f9216a8fa70bca4f937a719a0830b2be78cb8b5e5997a3bb0529
MD5 343f5c046b322f805d5d25282372c778
SHA1 17a2c6e8b73a5e0f3056033277d49db9378cdb72
SHA512 65fdfaee92cdb682cafdad8eee7d8d03f98ce81498d160e08b71aa03cc24a35542d9f8770a575ddf1b813bc83b42241bff48f323711c53a2ee98f4454f4980fd
MD5 SHA1 SHA512

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memory/2744-4-0x0000000002E90000-0x0000000002EE0000-memory.dmp

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memory/2744-9-0x0000000002F00000-0x0000000002F0E000-memory.dmp

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memory/2744-0-0x00007FF8E95B3000-0x00007FF8E95B5000-memory.dmp

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memory/2744-6-0x0000000002E20000-0x0000000002E76000-memory.dmp

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memory/2744-5-0x0000000002E00000-0x0000000002E16000-memory.dmp

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memory/2744-7-0x0000000002E70000-0x0000000002E82000-memory.dmp

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memory/2744-8-0x000000001C920000-0x000000001CE48000-memory.dmp

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memory/2744-3-0x0000000002DE0000-0x0000000002DFC000-memory.dmp

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memory/2744-10-0x0000000002F10000-0x0000000002F18000-memory.dmp

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memory/2744-11-0x0000000002F20000-0x0000000002F28000-memory.dmp

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memory/2744-2-0x00007FF8E95B0000-0x00007FF8EA071000-memory.dmp

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memory/2744-27-0x00007FF8E95B0000-0x00007FF8EA071000-memory.dmp

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memory/2744-1-0x0000000000A70000-0x0000000000CC2000-memory.dmp

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memory/3828-32-0x000000001C2B0000-0x000000001C306000-memory.dmp

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memory/3828-33-0x0000000003210000-0x0000000003222000-memory.dmp

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