dcrat | 7260ccf8becf9a3be8da0d1f04bccf0ac289e4cba63b2932c51cccec68cff542

Analysis

max time kernel
149s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
20/06/2024, 03:20

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General

Target
Gamesense.exe
Size 2.5MB
Sample240620-dvx4mawbph
SHA256 ebcefb989d32ca643f3560d4223e47cbbe2ea3c97755cf93b9b3fbabaf3545cf
MD5 6e292e2932951e7a1cb7dfc313121a6b
SHA1 72cf74f7ecf405b1f72fd3e42f541c30b2ff9fba
SHA512 ba6dda938a6c1beb724277b9c1b819d54467ce125de99619d19438d432f2273e785b94cd8c02ee747ceafe91159ce27d6fc891ba57f6365e2d4ff3afb1f06ed9
SSDEEP 49152:UbA30sHoNElLsaAB3Olt0BSXYAnjE5fqpCUdwUencN9:UbgHjlLsxeAIj5pCweO
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 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	4084	1216	schtasks.exe	97
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4600	1216	schtasks.exe	97
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3148	1216	schtasks.exe	97
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2852	1216	schtasks.exe	97
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4940	1216	schtasks.exe	97
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5056	1216	schtasks.exe	97

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000700000002364e-9.dat	dcrat
behavioral2/memory/4224-13-0x00000000002E0000-0x000000000050E000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 4 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-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	taskhostw.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	Gamesense.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3665033694-1447845302-680750983-1000\Control Panel\International\Geo\Nation	Blockdriverhost.exe

Executes dropped EXE 2 IoCs

pid	Process
4224	Blockdriverhost.exe
1920	taskhostw.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\System32\pt-PT\csrss.exe	Blockdriverhost.exe
File opened for modification	C:\Windows\System32\pt-PT\csrss.exe	Blockdriverhost.exe
File created	C:\Windows\System32\pt-PT\886983d96e3d3e	Blockdriverhost.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Cursors\taskhostw.exe	Blockdriverhost.exe
File created	C:\Windows\Cursors\ea9f0e6c9e2dcd	Blockdriverhost.exe

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

System Information Discovery
T1082

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3665033694-1447845302-680750983-1000_Classes\Local Settings	Gamesense.exe
Key created	\REGISTRY\USER\S-1-5-21-3665033694-1447845302-680750983-1000_Classes\Local Settings	taskhostw.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
4600	schtasks.exe
3148	schtasks.exe
2852	schtasks.exe
4940	schtasks.exe
5056	schtasks.exe
4084	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4224	Blockdriverhost.exe
4224	Blockdriverhost.exe
4224	Blockdriverhost.exe
4224	Blockdriverhost.exe
4224	Blockdriverhost.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe
1920	taskhostw.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1920	taskhostw.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4224	Blockdriverhost.exe
Token: SeDebugPrivilege	1920	taskhostw.exe
Token: SeBackupPrivilege	2296	vssvc.exe
Token: SeRestorePrivilege	2296	vssvc.exe
Token: SeAuditPrivilege	2296	vssvc.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3912 wrote to memory of 1696	3912	Gamesense.exe	90
PID 3912 wrote to memory of 1696	3912	Gamesense.exe	90
PID 3912 wrote to memory of 1696	3912	Gamesense.exe	90
PID 1696 wrote to memory of 1192	1696	WScript.exe	101
PID 1696 wrote to memory of 1192	1696	WScript.exe	101
PID 1696 wrote to memory of 1192	1696	WScript.exe	101
PID 1192 wrote to memory of 4224	1192	cmd.exe	103
PID 1192 wrote to memory of 4224	1192	cmd.exe	103
PID 4224 wrote to memory of 1920	4224	Blockdriverhost.exe	110
PID 4224 wrote to memory of 1920	4224	Blockdriverhost.exe	110
PID 1920 wrote to memory of 3628	1920	taskhostw.exe	112
PID 1920 wrote to memory of 3628	1920	taskhostw.exe	112
PID 1920 wrote to memory of 4528	1920	taskhostw.exe	113
PID 1920 wrote to memory of 4528	1920	taskhostw.exe	113

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
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\Gamesense.exe
"C:\Users\Admin\AppData\Local\Temp\Gamesense.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3912
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\bridgeFont\8kIXiGVnjvW92YDIHYq.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:1696
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\bridgeFont\A6eEKUh9zDmgALE.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1192
  - - C:\bridgeFont\Blockdriverhost.exe
      "C:\bridgeFont\Blockdriverhost.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4224
    - - C:\Windows\Cursors\taskhostw.exe
        
        "C:\Windows\Cursors\taskhostw.exe"
        5⤵
        Checks computer location settings
        Executes dropped EXE
        Modifies registry class
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1920
      - C:\Windows\System32\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\aedf1044-dcfc-4868-a24a-efe0f02a72e8.vbs"
        6⤵
        
        PID:3628
      - C:\Windows\System32\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\a194954c-002b-43e3-956a-3f9ebcef4094.vbs"
        6⤵
        
        PID:4528

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=3584,i,6041070687820623968,3004230300437737550,262144 --variations-seed-version --mojo-platform-channel-handle=4344 /prefetch:8
1⤵
PID:4652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 13 /tr "'C:\Windows\System32\pt-PT\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\pt-PT\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Windows\System32\pt-PT\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 11 /tr "'C:\Windows\Cursors\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Windows\Cursors\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\Windows\Cursors\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5056

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2296

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

a194954c-002b-43e3-956a-3f9ebcef4094.vbs

Path C:\Users\Admin\AppData\Local\Temp\a194954c-002b-43e3-956a-3f9ebcef4094.vbs
Size 484B
SHA256 ae9f8c339391df937a2640b6f34fd7428e225d49ea366dec4b2261036a395c8b
MD5 24e158b87d7e5908e3bf726dacb748ee
SHA1 86b12a08718fedbe8bbe6c7abd8e46ce604e8677
SHA512 0f8c10d39e82023ffa320e25fbaa9fd1ac2dcd194cb81bb2448542d99143a2e8c2690434bacd6ae285b902b2e3dedb93d4ac0c8555ce051a6e8580a28d384c27
MD5 SHA1 SHA512

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aedf1044-dcfc-4868-a24a-efe0f02a72e8.vbs

Path C:\Users\Admin\AppData\Local\Temp\aedf1044-dcfc-4868-a24a-efe0f02a72e8.vbs
Size 708B
SHA256 55547f6f3b2b83c60fb7a3c33c67c642573ab926cea35c88e1dca2eefb705500
MD5 e14b64dac82c5ee089cf907792c1f0fb
SHA1 b14f298836c23c6241194175e5fcd57a3d841ae3
SHA512 d5993dc873c55188ed347807205309737d944fd350fef4fc8e35a27dd48ef6ff7519786f13730be1ec66203ca908987098d6de78dbd36baaee568b91f6dede1e
MD5 SHA1 SHA512

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8kIXiGVnjvW92YDIHYq.vbe

Path C:\bridgeFont\8kIXiGVnjvW92YDIHYq.vbe
Size 203B
SHA256 21f91b10a8abe860f6cc78e0c229737187e13f30f773af62f27e630534039768
MD5 f834877689aa9f2dbd0d2084bb779fb4
SHA1 5bcadc4ef4b14e7c41b7fb0b9cf8d918bfabea67
SHA512 abbade5f776f7e1515bee59b5c01d7d39f89c14f12f72795b5fed7d7c82efb6508c34cbd267a5f6b16e285ae590f5769e28db6522187e5556da14d2bc1886034
MD5 SHA1 SHA512

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A6eEKUh9zDmgALE.bat

Path C:\bridgeFont\A6eEKUh9zDmgALE.bat
Size 35B
SHA256 f34a02f3f74a210905c17a168415de23a429c4f33f1943fd6ff7d86421ddcf87
MD5 a254cc5bfb66a33ccdee83d23ff8d10b
SHA1 40461cbacf4b71e94dd321fc30d7d69febd1e8ee
SHA512 f5f9a32b0e5ace91ee1b4a113c8413a7d61b3d2cc9878b73256e89cb3c59896b8b91b98e9adfb711ffbdd21137d030ddf6489c7fdd587c1b2955a8e65afea05e
MD5 SHA1 SHA512

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Blockdriverhost.exe

Path C:\bridgeFont\Blockdriverhost.exe
Size 2.2MB
SHA256 3bf9e41b570eeb923ed1f44e1fffa81fbd3dfe9f0324c594327d2d271af8cc6f
MD5 4021df69fad7e54ef1154a5322b1eece
SHA1 ece1a3140a5a394c4a57f110609b9d494e6f59f5
SHA512 0e0a18d8b319f2ff1de023ef8f43d905bbb47e08515ce91a02a868c5ed948fb02ee62576967512582c67da5593618526be8ae272a6e9b3fc4c664d40bd51e9d4
SSDEEP 49152:HHoNElLsaAB3Olt0BSXYAnjE5fqpCUdwUencN:HHjlLsxeAIj5pCwe
MD5 SHA1 SHA512 SSDEEP

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memory/4224-17-0x0000000002640000-0x000000000264C000-memory.dmp

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memory/4224-15-0x000000001B7C0000-0x000000001B816000-memory.dmp

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memory/4224-16-0x0000000002630000-0x000000000263C000-memory.dmp

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memory/4224-14-0x0000000002620000-0x0000000002628000-memory.dmp

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memory/4224-18-0x0000000002660000-0x0000000002672000-memory.dmp

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memory/4224-19-0x000000001BD40000-0x000000001C268000-memory.dmp

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memory/4224-20-0x000000001B170000-0x000000001B17C000-memory.dmp

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memory/4224-21-0x000000001B180000-0x000000001B18A000-memory.dmp

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memory/4224-22-0x000000001B190000-0x000000001B198000-memory.dmp

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memory/4224-23-0x000000001B1A0000-0x000000001B1AC000-memory.dmp

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memory/4224-13-0x00000000002E0000-0x000000000050E000-memory.dmp

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memory/4224-12-0x00007FFD91BF3000-0x00007FFD91BF5000-memory.dmp

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