dcrat | 71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
13-01-2025 01:34

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General

Target

71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Size

783KB
MD5

cf1bfee7761c04cb3d6bac55fd17f8e9
SHA1

626a9ced8310839072e9025f576060792efcdaae
SHA256

71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6
SHA512

db31cca344fa6b94591b55ab6aa918058f3165f11fe8dacde5f9513e8d8057714444ceea9d25db95ac5e112309ee16874ed6957569b9a9c8420c9cc7d72dc102
SSDEEP

12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q

Score

10^/10

dcrat evasion infostealer persistence rat trojan

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	2792	2528	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2008	2528	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2612	2528	schtasks.exe	28

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	csrss.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2228-1-0x00000000012A0000-0x000000000136A000-memory.dmp	dcrat
behavioral1/files/0x0006000000016d4a-31.dat	dcrat
behavioral1/files/0x0007000000014f7b-60.dat	dcrat
behavioral1/memory/2856-62-0x0000000000B80000-0x0000000000C4A000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2856	csrss.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\csrss = "\"C:\\Windows\\System32\\find\\csrss.exe\""	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Recovery\\1b8b1de2-69f6-11ef-9774-62cb582c238c\\Idle.exe\""	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\System32\\smss\\sppsvc.exe\""	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

Drops file in System32 directory 8 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\smss\sppsvc.exe	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File created	C:\Windows\System32\smss\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File created	C:\Windows\System32\find\csrss.exe	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File created	C:\Windows\System32\find\886983d96e3d3e31032c679b2d4ea91b6c05afef	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File opened for modification	C:\Windows\System32\smss\RCX539D.tmp	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File opened for modification	C:\Windows\System32\find\RCX560E.tmp	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File opened for modification	C:\Windows\System32\find\csrss.exe	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
File created	C:\Windows\System32\smss\sppsvc.exe	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.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
2008	schtasks.exe
2612	schtasks.exe
2792	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe
2856	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Token: SeDebugPrivilege	2856	csrss.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 1488	2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe	32
PID 2228 wrote to memory of 1488	2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe	32
PID 2228 wrote to memory of 1488	2228	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe	32
PID 1488 wrote to memory of 2736	1488	cmd.exe	34
PID 1488 wrote to memory of 2736	1488	cmd.exe	34
PID 1488 wrote to memory of 2736	1488	cmd.exe	34
PID 1488 wrote to memory of 2856	1488	cmd.exe	35
PID 1488 wrote to memory of 2856	1488	cmd.exe	35
PID 1488 wrote to memory of 2856	1488	cmd.exe	35

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe

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\71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe
"C:\Users\Admin\AppData\Local\Temp\71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6.exe"
1⤵
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2228
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\baDLdpmdjH.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1488
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2736
- - C:\Windows\System32\find\csrss.exe
    "C:\Windows\System32\find\csrss.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:2856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\smss\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\find\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2612

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

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RCX5199.tmp

Filesize
783KB

MD5
84889da61753f56f1efd9d213b92f33d

SHA1
9c52f72d60921b26360593df8803c9d8730f8179

SHA256
90370e40b392a1c452e5e7667309fe4f35e7d9c9ca3d68f382777c0b91e8502e

SHA512
8b4b7d249405ee2d43872c2dcf8647be83731e70bdbb2f4bd2845a8e33f79f8a42f0e9a835b5ee633bdfa13eefef95f33e36719c88d41a3b34c406b5dec91e88

Download Submit
C:\Users\Admin\AppData\Local\Temp\baDLdpmdjH.bat

Filesize
198B

MD5
89113207f6c60e28384e36ea02f564b1

SHA1
76469ccadc2ac3c1c5c74d6733f3a093ed29c541

SHA256
92fa5c3c69ea35b512e468cacfb2e3a365d4e5fd50838a4987f6643fca614f6e

SHA512
920f1028ed60e896c81a81d633d5d785a39c70b1b1cb4f62aee57b31fea026cd08cbe8cc17096c128be29e5601a7b00b5af6968c91276b87eed9a968c9385107

Download Submit
C:\Windows\System32\find\csrss.exe

Filesize
783KB

MD5
cf1bfee7761c04cb3d6bac55fd17f8e9

SHA1
626a9ced8310839072e9025f576060792efcdaae

SHA256
71be20190eec5f61710bdd083137d72791c5d1bf47b06dc9f7748e297ad945a6

SHA512
db31cca344fa6b94591b55ab6aa918058f3165f11fe8dacde5f9513e8d8057714444ceea9d25db95ac5e112309ee16874ed6957569b9a9c8420c9cc7d72dc102

Download Submit
memory/2228-12-0x0000000000500000-0x0000000000508000-memory.dmp

Filesize
32KB

Download
memory/2228-16-0x0000000000530000-0x0000000000538000-memory.dmp

Filesize
32KB

Download
memory/2228-4-0x0000000000250000-0x0000000000258000-memory.dmp

Filesize
32KB

Download
memory/2228-7-0x0000000000410000-0x000000000041C000-memory.dmp

Filesize
48KB

Download
memory/2228-3-0x0000000000240000-0x0000000000248000-memory.dmp

Filesize
32KB

Download
memory/2228-8-0x0000000000440000-0x000000000044A000-memory.dmp

Filesize
40KB

Download
memory/2228-9-0x00000000004E0000-0x00000000004EA000-memory.dmp

Filesize
40KB

Download
memory/2228-10-0x0000000000420000-0x0000000000428000-memory.dmp

Filesize
32KB

Download
memory/2228-11-0x0000000000430000-0x0000000000438000-memory.dmp

Filesize
32KB

Download
memory/2228-14-0x0000000000510000-0x0000000000518000-memory.dmp

Filesize
32KB

Download
memory/2228-13-0x00000000004F0000-0x00000000004F8000-memory.dmp

Filesize
32KB

Download
memory/2228-0-0x000007FEF58A3000-0x000007FEF58A4000-memory.dmp

Filesize
4KB

Download
memory/2228-15-0x0000000000520000-0x0000000000528000-memory.dmp

Filesize
32KB

Download
memory/2228-5-0x00000000003E0000-0x00000000003F0000-memory.dmp

Filesize
64KB

Download
memory/2228-17-0x0000000000540000-0x0000000000548000-memory.dmp

Filesize
32KB

Download
memory/2228-18-0x0000000000560000-0x0000000000568000-memory.dmp

Filesize
32KB

Download
memory/2228-20-0x0000000000570000-0x0000000000578000-memory.dmp

Filesize
32KB

Download
memory/2228-19-0x0000000000400000-0x0000000000408000-memory.dmp

Filesize
32KB

Download
memory/2228-21-0x0000000000DA0000-0x0000000000DAC000-memory.dmp

Filesize
48KB

Download
memory/2228-22-0x0000000000D70000-0x0000000000D78000-memory.dmp

Filesize
32KB

Download
memory/2228-25-0x000007FEF58A0000-0x000007FEF628C000-memory.dmp

Filesize
9.9MB

Download
memory/2228-6-0x00000000003F0000-0x00000000003F8000-memory.dmp

Filesize
32KB

Download
memory/2228-45-0x000007FEF58A0000-0x000007FEF628C000-memory.dmp

Filesize
9.9MB

Download
memory/2228-2-0x000007FEF58A0000-0x000007FEF628C000-memory.dmp

Filesize
9.9MB

Download
memory/2228-58-0x000007FEF58A0000-0x000007FEF628C000-memory.dmp

Filesize
9.9MB

Download
memory/2228-59-0x000007FEF58A0000-0x000007FEF628C000-memory.dmp

Filesize
9.9MB

Download
memory/2228-1-0x00000000012A0000-0x000000000136A000-memory.dmp

Filesize
808KB

Download
memory/2856-62-0x0000000000B80000-0x0000000000C4A000-memory.dmp

Filesize
808KB

Download