dcrat | 5656064ae4d3c302be4f376131bce57fa83ba30e94c329f33adb91836d7f4bf8

Analysis

max time kernel
121s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 06:25

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

35459ca7521a8565cf4acaadd346537b.exe
Size

984KB
MD5

35459ca7521a8565cf4acaadd346537b
SHA1

c22ce5beb121ecbba910dec28dedc0781d379524
SHA256

9622708341e5ac35563f5f258ae7736ad0a9f3c5875cfbf6e4570778b2e2c8bb
SHA512

691dc64caeb7a892b54c970f5d750a47a525004b162994c7e71eefbd4821c5c65961b2bbf08c356799e005de7c258fede7058cc3cc7f939f5ce1cd4ba40becd1
SSDEEP

12288:LzZvuvewk/0pPPXA5q/TQ9+n95vV25gnwHexSDwbwvDxlpaS98IUNldnd65EgF1s:LzZvuGD2PvA5YxwmbZB6Uv

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

description	ioc	pid	Process
		2820	schtasks.exe
		2896	schtasks.exe
File created	C:\Windows\System32\rasctrs\lsm.exe		35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\rasctrs\101b941d020240		35459ca7521a8565cf4acaadd346537b.exe
		2744	schtasks.exe
		2692	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 4 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	2744	2680	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2692	2680	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2820	2680	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2896	2680	schtasks.exe	31

Executes dropped EXE 1 IoCs

pid	Process
2300	lsm.exe

Adds Run key to start application 2 TTPs 4 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\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\WmiApRes\\WmiPrvSE.exe\""	35459ca7521a8565cf4acaadd346537b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Program Files (x86)\\Microsoft Office\\lsass.exe\""	35459ca7521a8565cf4acaadd346537b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\dsprov\\WmiPrvSE.exe\""	35459ca7521a8565cf4acaadd346537b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\rasctrs\\lsm.exe\""	35459ca7521a8565cf4acaadd346537b.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\System32\rasctrs\lsm.exe	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\rasctrs\101b941d020240	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\wbem\WmiApRes\WmiPrvSE.exe	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\wbem\WmiApRes\24dbde2999530e	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\rasctrs\RCXF114.tmp	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\rasctrs\lsm.exe	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\wbem\dsprov\WmiPrvSE.exe	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Windows\System32\wbem\dsprov\24dbde2999530e	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\wbem\WmiApRes\RCXF3A4.tmp	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\wbem\WmiApRes\WmiPrvSE.exe	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\wbem\dsprov\RCXF7AC.tmp	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Windows\System32\wbem\dsprov\WmiPrvSE.exe	35459ca7521a8565cf4acaadd346537b.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft Office\6203df4a6bafc7	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\RCXF5A8.tmp	35459ca7521a8565cf4acaadd346537b.exe
File opened for modification	C:\Program Files (x86)\Microsoft Office\lsass.exe	35459ca7521a8565cf4acaadd346537b.exe
File created	C:\Program Files (x86)\Microsoft Office\lsass.exe	35459ca7521a8565cf4acaadd346537b.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 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2744	schtasks.exe
2692	schtasks.exe
2820	schtasks.exe
2896	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1792	35459ca7521a8565cf4acaadd346537b.exe
1792	35459ca7521a8565cf4acaadd346537b.exe
1792	35459ca7521a8565cf4acaadd346537b.exe
1792	35459ca7521a8565cf4acaadd346537b.exe
1792	35459ca7521a8565cf4acaadd346537b.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1792	35459ca7521a8565cf4acaadd346537b.exe
Token: SeDebugPrivilege	2300	lsm.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1792 wrote to memory of 2300	1792	35459ca7521a8565cf4acaadd346537b.exe	36
PID 1792 wrote to memory of 2300	1792	35459ca7521a8565cf4acaadd346537b.exe	36
PID 1792 wrote to memory of 2300	1792	35459ca7521a8565cf4acaadd346537b.exe	36

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\35459ca7521a8565cf4acaadd346537b.exe
"C:\Users\Admin\AppData\Local\Temp\35459ca7521a8565cf4acaadd346537b.exe"
1⤵
- DcRat
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1792
- C:\Windows\System32\rasctrs\lsm.exe
  "C:\Windows\System32\rasctrs\lsm.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2300

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\rasctrs\lsm.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 "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\WmiApRes\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Office\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\dsprov\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2896

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\System32\rasctrs\lsm.exe

Filesize
984KB

MD5
35459ca7521a8565cf4acaadd346537b

SHA1
c22ce5beb121ecbba910dec28dedc0781d379524

SHA256
9622708341e5ac35563f5f258ae7736ad0a9f3c5875cfbf6e4570778b2e2c8bb

SHA512
691dc64caeb7a892b54c970f5d750a47a525004b162994c7e71eefbd4821c5c65961b2bbf08c356799e005de7c258fede7058cc3cc7f939f5ce1cd4ba40becd1

Download Submit
C:\Windows\System32\rasctrs\lsm.exe

Filesize
984KB

MD5
4b3372179cee6f79f7dcabb57c30234f

SHA1
49831d8cc707168a9fb207ec294f51611dfc79ab

SHA256
5aeba2c8305e16ae2fa0a4d59c6a785805b140e12d39338507a142f91593185e

SHA512
8b01d5188ee9a6ee140e6749f9b1cb047d2fb5c08bcbc6710c0661b8f4ba0333d693fee64d0ba8c7a1427ba60b4e87058193df28eace72f69af73890522bfb85

Download Submit
memory/1792-8-0x0000000000580000-0x000000000058C000-memory.dmp

Filesize
48KB

Download
memory/1792-9-0x00000000005A0000-0x00000000005B2000-memory.dmp

Filesize
72KB

Download
memory/1792-4-0x00000000003B0000-0x00000000003C0000-memory.dmp

Filesize
64KB

Download
memory/1792-5-0x0000000000560000-0x0000000000570000-memory.dmp

Filesize
64KB

Download
memory/1792-6-0x0000000000570000-0x0000000000578000-memory.dmp

Filesize
32KB

Download
memory/1792-7-0x0000000000590000-0x00000000005A0000-memory.dmp

Filesize
64KB

Download
memory/1792-0-0x000007FEF5813000-0x000007FEF5814000-memory.dmp

Filesize
4KB

Download
memory/1792-3-0x0000000000540000-0x000000000055C000-memory.dmp

Filesize
112KB

Download
memory/1792-10-0x00000000005B0000-0x00000000005BC000-memory.dmp

Filesize
48KB

Download
memory/1792-2-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

Filesize
9.9MB

Download
memory/1792-56-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

Filesize
9.9MB

Download
memory/1792-1-0x0000000000020000-0x000000000011C000-memory.dmp

Filesize
1008KB

Download
memory/2300-55-0x0000000000070000-0x000000000016C000-memory.dmp

Filesize
1008KB

Download
memory/2300-57-0x0000000000680000-0x0000000000692000-memory.dmp

Filesize
72KB

Download