dcrat | d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec

General

Target

d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Size

973KB
MD5

253a89ab5e44cbb0b5dd82d939bdaef5
SHA1

8be0ac5f520d74dbbce9687095609fc64f3ffd53
SHA256

d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec
SHA512

95f32123151550ccfb1fa9ee3a9e9b59508afcf96632e8ac2835fc04514406d51d78e8d33d3246c7db46f054e338f59617bbbafa7e6a0a384f35a1bf95c04eb8
SSDEEP

12288:nhhBMuext92N3cit1RGJV/H0uQ1PjmzBd5EBy10cgZMc29ZxasnLlDDE:n5E92NRzO/UFdmBchH29Zsg9E

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat 7 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
File created	C:\Windows\System32\NlsLexicons0c1a\69ddcba757bf72		d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
		2816	schtasks.exe
		2744	schtasks.exe
		2956	schtasks.exe
		2088	schtasks.exe
		2616	schtasks.exe
File created	C:\Windows\System32\NlsLexicons0c1a\smss.exe		d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Dcrat family
dcrat

Process spawned unexpected child process 5 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	2816	2692	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2744	2692	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2956	2692	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2088	2692	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2616	2692	schtasks.exe	29

Executes dropped EXE 1 IoCs

pid	Process
2896	lsass.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\NlsLexicons0c1a\\smss.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\NlsData0020\\dwm.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\eappgnui\\lsass.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\Fonts\\dwm.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\PerfLogs\\Admin\\smss.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\NlsLexicons0c1a\smss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\NlsData0020\dwm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\eappgnui\6203df4a6bafc7	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\NlsLexicons0c1a\smss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\NlsLexicons0c1a\69ddcba757bf72	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\NlsData0020\6cb0b6c459d5d3	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\eappgnui\lsass.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\NlsLexicons0c1a\RCX8316.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\NlsData0020\RCX8519.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\NlsData0020\dwm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\eappgnui\RCX871D.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\eappgnui\lsass.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Fonts\RCX8921.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\Fonts\dwm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\Fonts\dwm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\Fonts\6cb0b6c459d5d3	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2816	schtasks.exe
2744	schtasks.exe
2956	schtasks.exe
2088	schtasks.exe
2616	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Token: SeDebugPrivilege	2896	lsass.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2524 wrote to memory of 2896	2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	35
PID 2524 wrote to memory of 2896	2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	35
PID 2524 wrote to memory of 2896	2524	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	35

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\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
"C:\Users\Admin\AppData\Local\Temp\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe"
1⤵
- DcRat
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2524
- C:\Windows\System32\eappgnui\lsass.exe
  "C:\Windows\System32\eappgnui\lsass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2896

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\NlsLexicons0c1a\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\NlsData0020\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\eappgnui\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\Fonts\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2088

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\PerfLogs\Admin\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2616

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\PerfLogs\Admin\smss.exe

Filesize
973KB

MD5
253a89ab5e44cbb0b5dd82d939bdaef5

SHA1
8be0ac5f520d74dbbce9687095609fc64f3ffd53

SHA256
d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec

SHA512
95f32123151550ccfb1fa9ee3a9e9b59508afcf96632e8ac2835fc04514406d51d78e8d33d3246c7db46f054e338f59617bbbafa7e6a0a384f35a1bf95c04eb8

Download Submit
memory/2524-0-0x000007FEF5E93000-0x000007FEF5E94000-memory.dmp

Filesize
4KB

Download
memory/2524-1-0x00000000009B0000-0x0000000000AAA000-memory.dmp

Filesize
1000KB

Download
memory/2524-2-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/2524-3-0x00000000003E0000-0x00000000003E8000-memory.dmp

Filesize
32KB

Download
memory/2524-4-0x0000000000780000-0x0000000000790000-memory.dmp

Filesize
64KB

Download
memory/2524-5-0x0000000000790000-0x000000000079C000-memory.dmp

Filesize
48KB

Download
memory/2524-6-0x00000000007A0000-0x00000000007AC000-memory.dmp

Filesize
48KB

Download
memory/2524-7-0x00000000007B0000-0x00000000007B8000-memory.dmp

Filesize
32KB

Download
memory/2524-62-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/2896-61-0x0000000001320000-0x000000000141A000-memory.dmp

Filesize
1000KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads