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 10 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\NETSTAT\69ddcba757bf72		d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
		1752	schtasks.exe
		2928	schtasks.exe
		2768	schtasks.exe
File created	C:\Windows\System32\NETSTAT\smss.exe		d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
		2224	schtasks.exe
		2712	schtasks.exe
		2812	schtasks.exe
		2788	schtasks.exe
		2220	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 8 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	1752	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2928	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2224	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2812	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2788	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2768	1952	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2220	1952	schtasks.exe	30

Executes dropped EXE 1 IoCs

pid	Process
2084	OSPPSVC.exe

Adds Run key to start application 2 TTPs 8 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\lsm = "\"C:\\Documents and Settings\\lsm.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec = "\"C:\\Windows\\PCHEALTH\\ERRORREP\\QSIGNOFF\\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\bfsvc\\explorer.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\KBDROST\\csrss.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\NETSTAT\\smss.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPCEXT\\OSPPSVC.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\setspn\\lsm.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Program Files\\Windows Journal\\wininit.exe\""	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\System32\NETSTAT\smss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\NETSTAT\69ddcba757bf72	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\KBDROST\csrss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\setspn\RCXBFE8.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\NETSTAT\RCXBB74.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\setspn\lsm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\KBDROST\RCXCAD6.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\KBDROST\csrss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\System32\NETSTAT\smss.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\setspn\lsm.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\setspn\101b941d020240	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\System32\KBDROST\886983d96e3d3e	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Drops file in Program Files directory 8 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Journal\56085415360792	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\RCXBDE5.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\OSPPSVC.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Program Files\Windows Journal\RCXC1EC.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Program Files\Windows Journal\wininit.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\OSPPSVC.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\1610b97d3ab4a7	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Program Files\Windows Journal\wininit.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Drops file in Windows directory 8 IoCs

description	ioc	Process
File opened for modification	C:\Windows\bfsvc\explorer.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\PCHEALTH\ERRORREP\QSIGNOFF\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\PCHEALTH\ERRORREP\QSIGNOFF\14dcb484196c0b	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\bfsvc\explorer.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File created	C:\Windows\bfsvc\7a0fd90576e088	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\PCHEALTH\ERRORREP\QSIGNOFF\RCXC661.tmp	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\PCHEALTH\ERRORREP\QSIGNOFF\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
File opened for modification	C:\Windows\bfsvc\RCXC865.tmp	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 8 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2220	schtasks.exe
1752	schtasks.exe
2928	schtasks.exe
2224	schtasks.exe
2712	schtasks.exe
2812	schtasks.exe
2788	schtasks.exe
2768	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe
Token: SeDebugPrivilege	2084	OSPPSVC.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2484 wrote to memory of 2084	2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	39
PID 2484 wrote to memory of 2084	2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	39
PID 2484 wrote to memory of 2084	2484	d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe	39

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 Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2484
- C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\OSPPSVC.exe
  "C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\OSPPSVC.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\NETSTAT\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPCEXT\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\setspn\lsm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2224

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files\Windows Journal\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Documents and Settings\lsm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec" /sc ONLOGON /tr "'C:\Windows\PCHEALTH\ERRORREP\QSIGNOFF\d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2788

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\bfsvc\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\KBDROST\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2220

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:\Users\lsm.exe

Filesize
973KB

MD5
253a89ab5e44cbb0b5dd82d939bdaef5

SHA1
8be0ac5f520d74dbbce9687095609fc64f3ffd53

SHA256
d6d1b2020ca0764371016591ce25235a49372651dd5d8d5278decbdc6b9163ec

SHA512
95f32123151550ccfb1fa9ee3a9e9b59508afcf96632e8ac2835fc04514406d51d78e8d33d3246c7db46f054e338f59617bbbafa7e6a0a384f35a1bf95c04eb8

Download Submit
memory/2084-85-0x00000000001D0000-0x00000000002CA000-memory.dmp

Filesize
1000KB

Download
memory/2484-0-0x000007FEF5B63000-0x000007FEF5B64000-memory.dmp

Filesize
4KB

Download
memory/2484-1-0x0000000001220000-0x000000000131A000-memory.dmp

Filesize
1000KB

Download
memory/2484-2-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

Filesize
9.9MB

Download
memory/2484-3-0x0000000000460000-0x0000000000468000-memory.dmp

Filesize
32KB

Download
memory/2484-4-0x0000000000470000-0x0000000000480000-memory.dmp

Filesize
64KB

Download
memory/2484-5-0x0000000000480000-0x000000000048C000-memory.dmp

Filesize
48KB

Download
memory/2484-6-0x0000000000510000-0x000000000051C000-memory.dmp

Filesize
48KB

Download
memory/2484-7-0x0000000000520000-0x0000000000528000-memory.dmp

Filesize
32KB

Download
memory/2484-86-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads