dcrat | eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1

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 10 IoCs

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

rat infostealer dcrat

Processes:

schtasks.exeeda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
1468	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
2656	schtasks.exe
2736	schtasks.exe
1192	schtasks.exe
832	schtasks.exe
2520	schtasks.exe
1304	schtasks.exe
1604	schtasks.exe
2876	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2876	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2656	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2736	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1468	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1192	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	832	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2520	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1304	2976	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1604	2976	schtasks.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe	dcrat
behavioral1/memory/2816-13-0x0000000000CE0000-0x0000000000DEC000-memory.dmp	dcrat
behavioral1/memory/2316-38-0x0000000001200000-0x000000000130C000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exeservices.exe

pid process

2816 fontreviewwinsvcrefPerfdll.exe
2316 services.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

2932 cmd.exe
2932 cmd.exe

pid	process
2816	fontreviewwinsvcrefPerfdll.exe
2316	services.exe

pid	process
2932	cmd.exe
2932	cmd.exe

Adds Run key to start application 2 TTPs 9 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

fontreviewwinsvcrefPerfdll.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\ProgramData\\Documents\\cmd.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\PerfLogs\\Admin\\lsass.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Users\\Default User\\lsm.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\System32\\mfc120ita\\wininit.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\pnpsetup\\taskhost.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\write\\explorer.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Users\\All Users\\explorer.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Windows\\System32\\usp10\\conhost.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\cofiredm\\services.exe\""	fontreviewwinsvcrefPerfdll.exe

Drops file in System32 directory 9 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exe

description	ioc	process
File created	C:\Windows\System32\usp10\conhost.exe	fontreviewwinsvcrefPerfdll.exe
File opened for modification	C:\Windows\System32\usp10\conhost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\mfc120ita\560854153607923c4c5f107085a7db67be01f252	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\cofiredm\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\pnpsetup\taskhost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\pnpsetup\b75386f1303e64d8139363b71e44ac16341adf4e	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\usp10\088424020bedd6b28ac7fd22ee35dcd7322895ce	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\mfc120ita\wininit.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\cofiredm\services.exe	fontreviewwinsvcrefPerfdll.exe

Drops file in Windows directory 2 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exe

description	ioc	process
File created	C:\Windows\write\explorer.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\write\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	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

Processes:

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exeWScript.execmd.exe

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 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
2876	schtasks.exe
2656	schtasks.exe
1192	schtasks.exe
2520	schtasks.exe
1604	schtasks.exe
2736	schtasks.exe
1468	schtasks.exe
832	schtasks.exe
1304	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exe

pid process

2816 fontreviewwinsvcrefPerfdll.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exeservices.exe

description pid process

Token: SeDebugPrivilege 2816 fontreviewwinsvcrefPerfdll.exe
Token: SeDebugPrivilege 2316 services.exe

pid	process
2816	fontreviewwinsvcrefPerfdll.exe

description	pid	process
Token: SeDebugPrivilege	2816	fontreviewwinsvcrefPerfdll.exe
Token: SeDebugPrivilege	2316	services.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exeWScript.execmd.exefontreviewwinsvcrefPerfdll.exe

description	pid	process	target process
PID 1308 wrote to memory of 2596	1308	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 1308 wrote to memory of 2596	1308	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 1308 wrote to memory of 2596	1308	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 1308 wrote to memory of 2596	1308	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 2596 wrote to memory of 2932	2596	WScript.exe	cmd.exe
PID 2596 wrote to memory of 2932	2596	WScript.exe	cmd.exe
PID 2596 wrote to memory of 2932	2596	WScript.exe	cmd.exe
PID 2596 wrote to memory of 2932	2596	WScript.exe	cmd.exe
PID 2932 wrote to memory of 2816	2932	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 2932 wrote to memory of 2816	2932	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 2932 wrote to memory of 2816	2932	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 2932 wrote to memory of 2816	2932	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 2816 wrote to memory of 2316	2816	fontreviewwinsvcrefPerfdll.exe	services.exe
PID 2816 wrote to memory of 2316	2816	fontreviewwinsvcrefPerfdll.exe	services.exe
PID 2816 wrote to memory of 2316	2816	fontreviewwinsvcrefPerfdll.exe	services.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\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
"C:\Users\Admin\AppData\Local\Temp\eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1308
- 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:2596
- - 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:2932
  - - C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe
      "C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2816
    - - C:\Windows\System32\cofiredm\services.exe
        
        "C:\Windows\System32\cofiredm\services.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:2316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\usp10\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\System32\mfc120ita\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\cofiredm\services.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\write\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\All Users\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1192

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\pnpsetup\taskhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\ProgramData\Documents\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\PerfLogs\Admin\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Users\Default User\lsm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1604

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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/2316-38-0x0000000001200000-0x000000000130C000-memory.dmp

Filesize
1.0MB

Download
memory/2816-13-0x0000000000CE0000-0x0000000000DEC000-memory.dmp

Filesize
1.0MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads