dcrat | ffcd742b9d74fe93829e1b9955611e7cf9cd1e315776948a604a47cbd6aa6e93

General

Target

625ed8296450d13587142822e16d7d61.exe
Size

1.5MB
MD5

625ed8296450d13587142822e16d7d61
SHA1

ead1ac1c30fc324d24e3cc48c8ecc853a65b5f96
SHA256

ffcd742b9d74fe93829e1b9955611e7cf9cd1e315776948a604a47cbd6aa6e93
SHA512

56357e909af6010e4e36282e646fff87febe8b3942905c3d0a05b97b19be10aceaa4ba3465cd4280c80c5a037ed200291af2823dea680ec14774302162471187
SSDEEP

24576:L3m8i6zoGcFauvhT+elS5EH4LR40AFfThq7metAHEk:

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat 6 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

pid	Process
1820	schtasks.exe
1744	schtasks.exe
748	schtasks.exe
1160	schtasks.exe
2008	schtasks.exe
1404	schtasks.exe

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:/Users/Admin/AppData/Local/\\sppsvc.exe\", \"C:/Users/Admin/AppData/Local/\\lsass.exe\""	625ed8296450d13587142822e16d7d61.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:/Users/Admin/AppData/Local/\\sppsvc.exe\""	625ed8296450d13587142822e16d7d61.exe

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	1820	1716	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1744	1716	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	748	1716	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1160	1716	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2008	1716	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1404	1716	schtasks.exe	27

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1752-55-0x00000000004C0000-0x0000000000516000-memory.dmp	dcrat
behavioral1/memory/872-61-0x0000000000400000-0x0000000000456000-memory.dmp	dcrat
behavioral1/memory/1052-66-0x000000001A800000-0x000000001A856000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1052	lsass.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:/Users/Admin/AppData/Local/\\sppsvc.exe\""	625ed8296450d13587142822e16d7d61.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:/Users/Admin/AppData/Local/\\sppsvc.exe\""	625ed8296450d13587142822e16d7d61.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/\\lsass.exe\""	625ed8296450d13587142822e16d7d61.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/\\lsass.exe\""	625ed8296450d13587142822e16d7d61.exe

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

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

T1053

pid	Process
1744	schtasks.exe
748	schtasks.exe
1160	schtasks.exe
2008	schtasks.exe
1404	schtasks.exe
1820	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1752	625ed8296450d13587142822e16d7d61.exe
872	625ed8296450d13587142822e16d7d61.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe
1052	lsass.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1752	625ed8296450d13587142822e16d7d61.exe
Token: SeDebugPrivilege	872	625ed8296450d13587142822e16d7d61.exe
Token: SeDebugPrivilege	1052	lsass.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1752 wrote to memory of 1492	1752	625ed8296450d13587142822e16d7d61.exe	31
PID 1752 wrote to memory of 1492	1752	625ed8296450d13587142822e16d7d61.exe	31
PID 1752 wrote to memory of 1492	1752	625ed8296450d13587142822e16d7d61.exe	31
PID 1492 wrote to memory of 992	1492	cmd.exe	33
PID 1492 wrote to memory of 992	1492	cmd.exe	33
PID 1492 wrote to memory of 992	1492	cmd.exe	33
PID 1492 wrote to memory of 872	1492	cmd.exe	34
PID 1492 wrote to memory of 872	1492	cmd.exe	34
PID 1492 wrote to memory of 872	1492	cmd.exe	34
PID 872 wrote to memory of 1052	872	625ed8296450d13587142822e16d7d61.exe	38
PID 872 wrote to memory of 1052	872	625ed8296450d13587142822e16d7d61.exe	38
PID 872 wrote to memory of 1052	872	625ed8296450d13587142822e16d7d61.exe	38

C:\Users\Admin\AppData\Local\Temp\625ed8296450d13587142822e16d7d61.exe
"C:\Users\Admin\AppData\Local\Temp\625ed8296450d13587142822e16d7d61.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1752
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\s2Tjd9zbOj.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1492
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:992
- - C:\Users\Admin\AppData\Local\Temp\625ed8296450d13587142822e16d7d61.exe
    "C:\Users\Admin\AppData\Local\Temp\625ed8296450d13587142822e16d7d61.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:872
  - - C:\Users\Admin\AppData\Local\lsass.exe
      "C:\Users\Admin\AppData\Local\lsass.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:/Users/Admin/AppData/Local/\sppsvc.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:/Users/Admin/AppData/Local/\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 13 /tr "'C:/Users/Admin/AppData/Local/\lsass.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:/Users/Admin/AppData/Local/\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1404

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

Scheduled Task

Winlogon Helper DLL

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\s2Tjd9zbOj.bat

Filesize
235B

MD5
3911dfe8eb894d8daf02eb18f67f4f82

SHA1
8a54f0c52860f96d89face36bb9d52ef3ef04261

SHA256
fa4943881f17e8ddbd8b4ca4a62f4ea9d33d87572afd09ea41c73b9cf147d2d2

SHA512
f312063eae128ef548649087c48bac2916099f7acf07f77f404dbb191c8910fc45c6d8f99909fdc58439ddb5893b2f817c7879ecd86c7b4b9a206294ac7f7dc1

Download Submit
C:\Users\Admin\AppData\Local\lsass.exe

Filesize
1.5MB

MD5
625ed8296450d13587142822e16d7d61

SHA1
ead1ac1c30fc324d24e3cc48c8ecc853a65b5f96

SHA256
ffcd742b9d74fe93829e1b9955611e7cf9cd1e315776948a604a47cbd6aa6e93

SHA512
56357e909af6010e4e36282e646fff87febe8b3942905c3d0a05b97b19be10aceaa4ba3465cd4280c80c5a037ed200291af2823dea680ec14774302162471187

Download Submit
C:\Users\Admin\AppData\Local\lsass.exe

Filesize
1.5MB

MD5
625ed8296450d13587142822e16d7d61

SHA1
ead1ac1c30fc324d24e3cc48c8ecc853a65b5f96

SHA256
ffcd742b9d74fe93829e1b9955611e7cf9cd1e315776948a604a47cbd6aa6e93

SHA512
56357e909af6010e4e36282e646fff87febe8b3942905c3d0a05b97b19be10aceaa4ba3465cd4280c80c5a037ed200291af2823dea680ec14774302162471187

Download Submit
memory/872-60-0x0000000000230000-0x00000000003BE000-memory.dmp

Filesize
1.6MB

Download
memory/872-61-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1052-65-0x00000000000A0000-0x000000000022E000-memory.dmp

Filesize
1.6MB

Download
memory/1052-66-0x000000001A800000-0x000000001A856000-memory.dmp

Filesize
344KB

Download
memory/1752-55-0x00000000004C0000-0x0000000000516000-memory.dmp

Filesize
344KB

Download
memory/1752-54-0x0000000000E10000-0x0000000000F9E000-memory.dmp

Filesize
1.6MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads