dcrat | eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1

Analysis

max time kernel
118s
max time network
124s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
22-11-2024 07:31

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Size

1.3MB
MD5

85557604dc44ef6128cf359f9516a773
SHA1

ccc47c852610d56888b86a89fb2efbd881348f73
SHA256

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1
SHA512

4a868472b6d325557ce4556b019dfde667956d64bc91f312af2e6a9ae1fa6640afd7e6ee5c4a1ef26e7356e704c5395eddeee372b250ac1973bd613b8c38346c
SSDEEP

24576:U2G/nvxW3Ww0t5N7MCHS/+tqnmJZqmsIma/59qihru6Lc+4Z:UbA30jMAl74mHWiBbc

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 5 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
		2256	schtasks.exe
		1716	schtasks.exe
		1328	schtasks.exe
		548	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	2256	2680	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1716	2680	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1328	2680	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	548	2680	schtasks.exe	34

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00080000000162e9-9.dat	dcrat
behavioral1/memory/3044-13-0x0000000000DB0000-0x0000000000EBC000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
3044	fontreviewwinsvcrefPerfdll.exe

Loads dropped DLL 2 IoCs

pid	Process
2792	cmd.exe
2792	cmd.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\sppsvc = "\"C:\\Windows\\System32\\wdi\\sppsvc.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\MSOCache\\All Users\\{90140000-0011-0000-0000-0000000FF1CE}-C\\cmd.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\System32\\mciqtz32\\wininit.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\NlsLexicons004b\\lsass.exe\""	fontreviewwinsvcrefPerfdll.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\wdi\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\mciqtz32\wininit.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\mciqtz32\560854153607923c4c5f107085a7db67be01f252	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\NlsLexicons004b\lsass.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\NlsLexicons004b\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\wdi\sppsvc.exe	fontreviewwinsvcrefPerfdll.exe
File opened for modification	C:\Windows\System32\wdi\sppsvc.exe	fontreviewwinsvcrefPerfdll.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

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
1328	schtasks.exe
548	schtasks.exe
2256	schtasks.exe
1716	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe
3044	fontreviewwinsvcrefPerfdll.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3044	fontreviewwinsvcrefPerfdll.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 2180	2740	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	30
PID 2740 wrote to memory of 2180	2740	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	30
PID 2740 wrote to memory of 2180	2740	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	30
PID 2740 wrote to memory of 2180	2740	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	30
PID 2180 wrote to memory of 2792	2180	WScript.exe	31
PID 2180 wrote to memory of 2792	2180	WScript.exe	31
PID 2180 wrote to memory of 2792	2180	WScript.exe	31
PID 2180 wrote to memory of 2792	2180	WScript.exe	31
PID 2792 wrote to memory of 3044	2792	cmd.exe	33
PID 2792 wrote to memory of 3044	2792	cmd.exe	33
PID 2792 wrote to memory of 3044	2792	cmd.exe	33
PID 2792 wrote to memory of 3044	2792	cmd.exe	33

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\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
"C:\Users\Admin\AppData\Local\Temp\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2740
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\fontreviewwinsvc\HZSUF0ENoqATgs2xuBB5SnvQ30qsZ.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2180
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\fontreviewwinsvc\JAvevGsJOHZ7p.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2792
  - - C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe
      "C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\wdi\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\System32\mciqtz32\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\NlsLexicons004b\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:548

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\fontreviewwinsvc\HZSUF0ENoqATgs2xuBB5SnvQ30qsZ.vbe

Filesize
206B

MD5
6516a4960a6cd91391f10cdd67452a43

SHA1
49df369838b52c8f393602685e3598474b0c8894

SHA256
e4eaa44532ad70a2f8f8f92b474a262a8f30eadbe46e9afcbc960be15dc32c53

SHA512
c3ccef7b360c776486e9d9173adef25a9022ad046f52dcbbe4ec56986d989e8bd5a1c0ff64cd68bd48065557cb505139a221d924c004086f2f821fb683147271

Download Submit
C:\fontreviewwinsvc\JAvevGsJOHZ7p.bat

Filesize
52B

MD5
22db99b6cb738df9778a2cbaea5c8d65

SHA1
317794f9120a203cef9d4a54c8b03a945a3e285b

SHA256
4af63f08cbfb0666776f281d9bc73c766d911580061048e59ea6ea7093d65f88

SHA512
8ab77efc664b9617e11dd707beea570960395a08b721bd2f81d9bfc3740e72b0ced58da3e5b870ca550435f3aec2df4e144a27d1fb9f001a41ec51f66a5afec9

Download Submit
\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe

Filesize
1.0MB

MD5
193a3f45ff80ed77a5c041e5f1f1beb7

SHA1
7ff88a38ee281b02b7f5279d2cd801e647becd73

SHA256
03c5a982b0c3cd3144eaaff24b52a6480f4dc0680f0a006cf59f20565e7497ce

SHA512
20f067f2f552cd19f71519e86fc2b1f2dc7c31a7aa8c22400cba7a7a985b3c61ce659d1bfbf3762bb90ff451f8678d7c7d3a1c26f3280a9d7289c0fb8aa6218b

Download Submit
memory/3044-13-0x0000000000DB0000-0x0000000000EBC000-memory.dmp

Filesize
1.0MB

Download
memory/3044-23-0x00000000005B0000-0x00000000005BC000-memory.dmp

Filesize
48KB

Download
memory/3044-24-0x00000000005C0000-0x00000000005CE000-memory.dmp

Filesize
56KB

Download
memory/3044-25-0x00000000005D0000-0x00000000005D8000-memory.dmp

Filesize
32KB

Download
memory/3044-26-0x00000000005F0000-0x00000000005F8000-memory.dmp

Filesize
32KB

Download