dcrat | 55edcf08f8521a9cddde8570baaac0ab8ef6e640e96c834db0e5c12f5b9c68fe

Analysis

max time kernel
122s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 06:18

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General

Target

f26d7a764816fad6183d06a6fc996857.exe
Size

984KB
MD5

f26d7a764816fad6183d06a6fc996857
SHA1

ab68307f5b1f1fbe0c99fcbed2b6d6ee3f596409
SHA256

dd6f503f280cc68627a4ef5082596457d1e608d0aef4a7f0d33e0640e520b81e
SHA512

d3b46e095ceb3cd56975c27708726d6d07a96c7c58aa3273630bfac596608eb868061655177140aef74e71728cd51427a91a9a36fbb4d4cbb2f1fc3c6c50ddfe
SSDEEP

12288:rzZvuvewk/0pPPXA5q/TQ9+n95vV25gnwHexSDwbwvDxlpaS98IUNldnd65EgF1s:rzZvuGD2PvA5YxwmbZB6Uv

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Dcrat family
dcrat

Process spawned unexpected child process 3 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	2860	2664	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2692	2664	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2716	2664	schtasks.exe	31

Executes dropped EXE 1 IoCs

pid	Process
2140	sppsvc.exe

Adds Run key to start application 2 TTPs 3 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\lsass = "\"C:\\Windows\\System32\\cmpbk32\\lsass.exe\""	f26d7a764816fad6183d06a6fc996857.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\onexui\\csrss.exe\""	f26d7a764816fad6183d06a6fc996857.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\System32\\AuditNativeSnapIn\\sppsvc.exe\""	f26d7a764816fad6183d06a6fc996857.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe	f26d7a764816fad6183d06a6fc996857.exe
File created	C:\Windows\System32\cmpbk32\lsass.exe	f26d7a764816fad6183d06a6fc996857.exe
File created	C:\Windows\System32\cmpbk32\6203df4a6bafc7	f26d7a764816fad6183d06a6fc996857.exe
File created	C:\Windows\System32\onexui\csrss.exe	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\AuditNativeSnapIn\RCXEACD.tmp	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\cmpbk32\RCXECD1.tmp	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\cmpbk32\lsass.exe	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe	f26d7a764816fad6183d06a6fc996857.exe
File created	C:\Windows\System32\AuditNativeSnapIn\0a1fd5f707cd16	f26d7a764816fad6183d06a6fc996857.exe
File created	C:\Windows\System32\onexui\886983d96e3d3e	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\onexui\RCXEED5.tmp	f26d7a764816fad6183d06a6fc996857.exe
File opened for modification	C:\Windows\System32\onexui\csrss.exe	f26d7a764816fad6183d06a6fc996857.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 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2860	schtasks.exe
2692	schtasks.exe
2716	schtasks.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
2140	sppsvc.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2080	f26d7a764816fad6183d06a6fc996857.exe
2080	f26d7a764816fad6183d06a6fc996857.exe
2080	f26d7a764816fad6183d06a6fc996857.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2080	f26d7a764816fad6183d06a6fc996857.exe
Token: SeDebugPrivilege	2140	sppsvc.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 2564	2080	f26d7a764816fad6183d06a6fc996857.exe	35
PID 2080 wrote to memory of 2564	2080	f26d7a764816fad6183d06a6fc996857.exe	35
PID 2080 wrote to memory of 2564	2080	f26d7a764816fad6183d06a6fc996857.exe	35
PID 2564 wrote to memory of 2632	2564	cmd.exe	37
PID 2564 wrote to memory of 2632	2564	cmd.exe	37
PID 2564 wrote to memory of 2632	2564	cmd.exe	37
PID 2564 wrote to memory of 2140	2564	cmd.exe	38
PID 2564 wrote to memory of 2140	2564	cmd.exe	38
PID 2564 wrote to memory of 2140	2564	cmd.exe	38
PID 2564 wrote to memory of 2140	2564	cmd.exe	38
PID 2564 wrote to memory of 2140	2564	cmd.exe	38

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\f26d7a764816fad6183d06a6fc996857.exe
"C:\Users\Admin\AppData\Local\Temp\f26d7a764816fad6183d06a6fc996857.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2080
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\cCgr87D50L.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2632
- - C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe
    "C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: CmdExeWriteProcessMemorySpam
    - Suspicious use of AdjustPrivilegeToken
    PID:2140

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\cmpbk32\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2860

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

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\cCgr87D50L.bat

Filesize
212B

MD5
05e1a1500b0c9d9290b69f5a98eac7cb

SHA1
34a37498bac1a4bcf4d2d68f27b596ae86c2484a

SHA256
a00891bb7d323a4a19c9c11dc2a1a2ac2ec965bebd62f11a41647412098185ef

SHA512
5ce7ab04ccfd9670305c726923435ba4bfac508779cea7dbad7b46b6cb2762358ab2a26d5404248e266e48fabf0bee5b567ccf90af9a91633b56a69e3c3c912c

Download Submit
C:\Windows\System32\AuditNativeSnapIn\sppsvc.exe

Filesize
984KB

MD5
f26d7a764816fad6183d06a6fc996857

SHA1
ab68307f5b1f1fbe0c99fcbed2b6d6ee3f596409

SHA256
dd6f503f280cc68627a4ef5082596457d1e608d0aef4a7f0d33e0640e520b81e

SHA512
d3b46e095ceb3cd56975c27708726d6d07a96c7c58aa3273630bfac596608eb868061655177140aef74e71728cd51427a91a9a36fbb4d4cbb2f1fc3c6c50ddfe

Download Submit
memory/2080-6-0x0000000000600000-0x0000000000608000-memory.dmp

Filesize
32KB

Download
memory/2080-3-0x0000000000440000-0x000000000045C000-memory.dmp

Filesize
112KB

Download
memory/2080-7-0x0000000000610000-0x0000000000620000-memory.dmp

Filesize
64KB

Download
memory/2080-8-0x0000000000620000-0x000000000062C000-memory.dmp

Filesize
48KB

Download
memory/2080-0-0x000007FEF5B73000-0x000007FEF5B74000-memory.dmp

Filesize
4KB

Download
memory/2080-9-0x0000000000840000-0x0000000000852000-memory.dmp

Filesize
72KB

Download
memory/2080-10-0x0000000000870000-0x000000000087C000-memory.dmp

Filesize
48KB

Download
memory/2080-5-0x00000000005F0000-0x0000000000600000-memory.dmp

Filesize
64KB

Download
memory/2080-4-0x00000000005E0000-0x00000000005F0000-memory.dmp

Filesize
64KB

Download
memory/2080-2-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2080-44-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2080-1-0x0000000000980000-0x0000000000A7C000-memory.dmp

Filesize
1008KB

Download
memory/2140-48-0x00000000011A0000-0x000000000129C000-memory.dmp

Filesize
1008KB

Download