dcrat | c9bf7c3aed4fed475173d2204df58448de6f344a3fbf3a9fa681d90954621351

General

Target
74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe
Size 1.1MB
Sample240707-eqvndawbka
SHA256 74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2
MD5 23da28c4e7244ad5a01bca486fbf1d65
SHA1 e8691baebb1b904cd1a4c1ef08e3708c17e036ec
SHA512 d8b9353b6af572b660ce3115f491e6ff0e50414ef6c4411904f348d8dd179fc7c62aec27d4fcce127961043f8d328537322cf6ecff1da054b68ba28dfec03499
SSDEEP 24576:U2G/nvxW3Ww0tniAMLgZBb8IfRZ8pxHBfP0eMbFa/y:UbA30iLIVL8pxhp6V
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 21 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	1608	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3064	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2744	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2232	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2252	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	964	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1856	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1548	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3616	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	776	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2152	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4516	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4476	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4016	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2200	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1380	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3160	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4916	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3580	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5116	3132	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3660	3132	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00070000000234d3-10.dat	dcrat
behavioral2/memory/3356-13-0x0000000000D50000-0x0000000000E26000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-1403246978-718555486-3105247137-1000\Control Panel\International\Geo\Nation	74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1403246978-718555486-3105247137-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1403246978-718555486-3105247137-1000\Control Panel\International\Geo\Nation	savesmonitor.exe

Executes dropped EXE 2 IoCs

pid	Process
3356	savesmonitor.exe
3636	dllhost.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
16	ipinfo.io
17	ipinfo.io

Drops file in Program Files directory 7 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Microsoft Office\explorer.exe	savesmonitor.exe
File created	C:\Program Files\Microsoft Office\7a0fd90576e088	savesmonitor.exe
File created	C:\Program Files\Windows NT\Accessories\en-US\wininit.exe	savesmonitor.exe
File created	C:\Program Files\Windows NT\Accessories\en-US\56085415360792	savesmonitor.exe
File created	C:\Program Files (x86)\Windows Defender\ja-JP\sihost.exe	savesmonitor.exe
File created	C:\Program Files (x86)\Windows Defender\ja-JP\66fc9ff0ee96c2	savesmonitor.exe
File created	C:\Program Files\Microsoft Office\explorer.exe	savesmonitor.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\System\9e8d7a4ca61bd9	savesmonitor.exe
File created	C:\Windows\ServiceState\WinHttpAutoProxySvc\Data\fontdrvhost.exe	savesmonitor.exe
File created	C:\Windows\System\RuntimeBroker.exe	savesmonitor.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-1-5-21-1403246978-718555486-3105247137-1000_Classes\Local Settings	74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe
Key created	\REGISTRY\USER\S-1-5-21-1403246978-718555486-3105247137-1000_Classes\Local Settings	savesmonitor.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2152	schtasks.exe
1380	schtasks.exe
3580	schtasks.exe
1608	schtasks.exe
3064	schtasks.exe
1856	schtasks.exe
1548	schtasks.exe
4476	schtasks.exe
4016	schtasks.exe
2200	schtasks.exe
3160	schtasks.exe
2744	schtasks.exe
2252	schtasks.exe
3616	schtasks.exe
776	schtasks.exe
2232	schtasks.exe
964	schtasks.exe
5116	schtasks.exe
3660	schtasks.exe
4516	schtasks.exe
4916	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
3356	savesmonitor.exe
3356	savesmonitor.exe
3356	savesmonitor.exe
3356	savesmonitor.exe
3356	savesmonitor.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe
3636	dllhost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3636	dllhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3356	savesmonitor.exe
Token: SeDebugPrivilege	3636	dllhost.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 3732	2420	74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe	85
PID 2420 wrote to memory of 3732	2420	74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe	85
PID 2420 wrote to memory of 3732	2420	74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe	85
PID 3732 wrote to memory of 1904	3732	WScript.exe	86
PID 3732 wrote to memory of 1904	3732	WScript.exe	86
PID 3732 wrote to memory of 1904	3732	WScript.exe	86
PID 1904 wrote to memory of 3356	1904	cmd.exe	88
PID 1904 wrote to memory of 3356	1904	cmd.exe	88
PID 3356 wrote to memory of 4480	3356	savesmonitor.exe	111
PID 3356 wrote to memory of 4480	3356	savesmonitor.exe	111
PID 4480 wrote to memory of 4576	4480	cmd.exe	113
PID 4480 wrote to memory of 4576	4480	cmd.exe	113
PID 4480 wrote to memory of 3636	4480	cmd.exe	114
PID 4480 wrote to memory of 3636	4480	cmd.exe	114

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\74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe
"C:\Users\Admin\AppData\Local\Temp\74146ce7e5b14f6448572915ea28657f1f35c161876e38e4c953b81bca8696b2.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2420
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\portComponenthostcommon\csororMRWqKHCeyVGrLT4ODzVElXhp.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3732
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\portComponenthostcommon\jJBxMiEy855XbWerIlP.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1904
  - - C:\portComponenthostcommon\savesmonitor.exe
      "C:\portComponenthostcommon\savesmonitor.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      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:3356
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\cJPf1Vjg33.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4480
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4576
      - C:\Recovery\WindowsRE\dllhost.exe
        
        "C:\Recovery\WindowsRE\dllhost.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:3636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 9 /tr "'C:\Program Files\Microsoft Office\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Program Files\Microsoft Office\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows NT\Accessories\en-US\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files\Windows NT\Accessories\en-US\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2252

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows NT\Accessories\en-US\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 11 /tr "'C:\portComponenthostcommon\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\portComponenthostcommon\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 12 /tr "'C:\portComponenthostcommon\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\portComponenthostcommon\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\portComponenthostcommon\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2152

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\portComponenthostcommon\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4516

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\System\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2200

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\System\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1380

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3580

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5116

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3660

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

cJPf1Vjg33.bat

Path C:\Users\Admin\AppData\Local\Temp\cJPf1Vjg33.bat
Size 198B
SHA256 43e2335008ec696f3ba20895fcb68fc9b081c7b1d004caa2f0ec3d8dedd19725
MD5 de239376e5d7fd94eb5c1336ae5d26c4
SHA1 800044f988163cb334af26fe46a17143baa81159
SHA512 aca735720c6a92cbb3a5e8f9a2b4bd1a475827354d9756e8d62f96fedab2c1d8f6fd46fdef1ccb328f3b5115cc0da01e3d0b38eb3ff4ae75fd607eff871ca492
MD5 SHA1 SHA512

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csororMRWqKHCeyVGrLT4ODzVElXhp.vbe

Path C:\portComponenthostcommon\csororMRWqKHCeyVGrLT4ODzVElXhp.vbe
Size 219B
SHA256 1049c71fadf851b5a212b2a1b5b3c9b213b422f14bda027f435166542c999773
MD5 f37a7ec55b9accdbe5fb943a8203118e
SHA1 f8fbcfde976eea093fef8d03756a20f2d3aaf876
SHA512 460a8721821d653784eed1883844e9a91bd14ac78b838dc884792baac2add51d1e2230c89860418245b121515d90f817c0a3c208b50f87f3d2e5e46581d2efd8
MD5 SHA1 SHA512

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jJBxMiEy855XbWerIlP.bat

Path C:\portComponenthostcommon\jJBxMiEy855XbWerIlP.bat
Size 45B
SHA256 12ca0bf88523b11ab0f26615aa1f356729fb73cc045146b53e3ead57bde5285f
MD5 b6eb4ace92e0d3d484d2fd9f2a3a8273
SHA1 a04505e65a99fbdbe965c63a09de6a564a237b20
SHA512 427390745b2e37c6cc5b17d0fc87a315f41db1d5f4fe17386650a5d457656d53f7ad15ee19ecb9194bcd8e885c36334167e16020711054abad319fc6bf91c9f6
MD5 SHA1 SHA512

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savesmonitor.exe

Path C:\portComponenthostcommon\savesmonitor.exe
Size 827KB
SHA256 dc8f4cbee11b4c516efa0091015e9f9d7a3643cb0335029687780ee313668053
MD5 757f10931f034e84725db1960591ef08
SHA1 8c6f9bf2e63c2347dd8a4dbdf885b6e3d598dfc7
SHA512 761780b10eb17d7db7e9847ae0b33711ae3ff51b720a7845baa0e2efeeb5627371747249d9140866962b197a29b62db3dfa33fce752f9b64ca7749dbcf1f6ab7
SSDEEP 12288:xsBJAMLgZT4ib8IfRiO8pIwNCXI1BBftd0e9hgbF6h/:xiAMLgZBb8IfRZ8pxHBfP0eMbFa/
MD5 SHA1 SHA512 SSDEEP

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memory/3356-12-0x00007FF92AA33000-0x00007FF92AA35000-memory.dmp

Download

memory/3356-13-0x0000000000D50000-0x0000000000E26000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads