dcrat | ff50267ebed21e418f8469347853e57ddf373c68db52b8ce2019377a731bd0a4

General

Target
2768c63cfbffae59b6c2c5483e804d14.exe
Size 1.1MB
Sample240513-pjbl2afa95
SHA256 ff50267ebed21e418f8469347853e57ddf373c68db52b8ce2019377a731bd0a4
MD5 2768c63cfbffae59b6c2c5483e804d14
SHA1 a577f6aa123f1b641a780ef4cf205b73c2b2bfc3
SHA512 7ae59899ac9d77e98f5f52e2eeee350bade1aab284fc65bb64ba1ff605a8c7148ae535b8b69bb0fedfde6449becd87b5a0678ce241414d54b7b759c36dd0da04
SSDEEP 24576:U2G/nvxW3Ww0tkAyVPwER/v6Yq9/zI2SV6/6ODpvdcKRWksjQ:UbA30kAyRwE332SV6XDzRLs0
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	3136	4800	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4892	4800	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	420	4800	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3296	4800	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2416	4800	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4188	4800	schtasks.exe	91

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00070000000233ec-10.dat	dcrat
behavioral2/memory/2276-13-0x00000000002D0000-0x00000000003A6000-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-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	MsRuntimeperf.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	2768c63cfbffae59b6c2c5483e804d14.exe

Executes dropped EXE 2 IoCs

pid	Process
2276	MsRuntimeperf.exe
1604	services.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft\services.exe	MsRuntimeperf.exe
File created	C:\Program Files (x86)\Microsoft\c5b4cb5e9653cc	MsRuntimeperf.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 6 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2416	schtasks.exe
4188	schtasks.exe
3136	schtasks.exe
4892	schtasks.exe
420	schtasks.exe
3296	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000_Classes\Local Settings	2768c63cfbffae59b6c2c5483e804d14.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2276	MsRuntimeperf.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe
1604	services.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1604	services.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2276	MsRuntimeperf.exe
Token: SeDebugPrivilege	1604	services.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1776 wrote to memory of 1704	1776	2768c63cfbffae59b6c2c5483e804d14.exe	83
PID 1776 wrote to memory of 1704	1776	2768c63cfbffae59b6c2c5483e804d14.exe	83
PID 1776 wrote to memory of 1704	1776	2768c63cfbffae59b6c2c5483e804d14.exe	83
PID 1704 wrote to memory of 4220	1704	WScript.exe	88
PID 1704 wrote to memory of 4220	1704	WScript.exe	88
PID 1704 wrote to memory of 4220	1704	WScript.exe	88
PID 4220 wrote to memory of 2276	4220	cmd.exe	90
PID 4220 wrote to memory of 2276	4220	cmd.exe	90
PID 2276 wrote to memory of 1604	2276	MsRuntimeperf.exe	98
PID 2276 wrote to memory of 1604	2276	MsRuntimeperf.exe	98

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\2768c63cfbffae59b6c2c5483e804d14.exe
"C:\Users\Admin\AppData\Local\Temp\2768c63cfbffae59b6c2c5483e804d14.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1776
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\portMonitor\7qmHZrFz6PlKEeySf7g6q7bPLdDi.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:1704
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\portMonitor\1iRUSp.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4220
  - - C:\portMonitor\MsRuntimeperf.exe
      "C:\portMonitor\MsRuntimeperf.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2276
    - - C:\Program Files (x86)\Microsoft\services.exe
        
        "C:\Program Files (x86)\Microsoft\services.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 10 /tr "'C:\portMonitor\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3136

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\portMonitor\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4892

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\portMonitor\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4188

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

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

1iRUSp.bat

Path C:\portMonitor\1iRUSp.bat
Size 34B
SHA256 bf1a6596c9cb4f855e364b1b2f4e065d3c3db14814e4cb933a45dc1929604bab
MD5 e7d861bf32c0cfdce43a988f7624094b
SHA1 ce94364c1662056c36487d1ad2a3910d60295567
SHA512 f4e9116284beb83c4b459f386fb1cb2573769c937082a3dd1efb5ebf73693e9ad03be4cb691476720d8a7841b29aea1bd8f57e7070e15baf293c0683dc553f04
MD5 SHA1 SHA512

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7qmHZrFz6PlKEeySf7g6q7bPLdDi.vbe

Path C:\portMonitor\7qmHZrFz6PlKEeySf7g6q7bPLdDi.vbe
Size 194B
SHA256 3d992a2df8f78acb01aacd43662b8ef67810149dd6c40b96f5d88ce9ba8e215e
MD5 549bfbdf4b94348d8d90e99da8c2251e
SHA1 5a137b4eca702e1154f27729b4bd4de2e66e7562
SHA512 c3a5f93b0dde2d1a00133e22014d7b3b8d59c2780b426429d9fa98d3e32e66d6697de50af714b3375d82034f77feba7b90336b8d44767a2eaacd77129dc13793
MD5 SHA1 SHA512

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MsRuntimeperf.exe

Path C:\portMonitor\MsRuntimeperf.exe
Size 828KB
SHA256 19ad2d50f71214129742f9e3901ee595f760b36d5cac676911c3ee0ec7c6546d
MD5 4168f956abf60ffe49acc17b2544866f
SHA1 92c00da15b67c3fbc23a74198b1220c55dc56fec
SHA512 938a4e85094d517e0ca9ef96edd2dfef75accd5d7546da44a921be023dcd066fcab51688b1f7036f67f7dcd3d0e7aedafccc58abee2b22c15da1bb05ec002a0e
SSDEEP 24576:gAyVPwER/v6Yq9/zI2SV6/6ODpvdcKRWksj:gAyRwE332SV6XDzRLs
MD5 SHA1 SHA512 SSDEEP

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memory/2276-12-0x00007FF9F4743000-0x00007FF9F4745000-memory.dmp

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memory/2276-13-0x00000000002D0000-0x00000000003A6000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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