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
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.

Processes:

schtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	800	3660	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1432	3660	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	216	3660	schtasks.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe	dcrat
behavioral2/memory/1124-13-0x0000000000F60000-0x000000000106C000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exeWScript.exefontreviewwinsvcrefPerfdll.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	fontreviewwinsvcrefPerfdll.exe

Executes dropped EXE 2 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exeSppExtComObj.exe

pid process

1124 fontreviewwinsvcrefPerfdll.exe
1376 SppExtComObj.exe

Adds Run key to start application 2 TTPs 3 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\dwm = "\"C:\\ProgramData\\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\\dwm.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Windows\\System32\\aclui\\SppExtComObj.exe\""	fontreviewwinsvcrefPerfdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sihost = "\"C:\\Windows\\System32\\LanguagePackDiskCleanup\\sihost.exe\""	fontreviewwinsvcrefPerfdll.exe

Drops file in System32 directory 4 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exe

description	ioc	process
File created	C:\Windows\System32\LanguagePackDiskCleanup\sihost.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\LanguagePackDiskCleanup\66fc9ff0ee96c2b21f0cfded48750ae9e3032bf3	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\aclui\SppExtComObj.exe	fontreviewwinsvcrefPerfdll.exe
File created	C:\Windows\System32\aclui\e1ef82546f0b02b7e974f28047f3788b1128cce1	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

Modifies registry class 2 IoCs

Processes:

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exefontreviewwinsvcrefPerfdll.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	fontreviewwinsvcrefPerfdll.exe

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

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid process

800 schtasks.exe
1432 schtasks.exe
216 schtasks.exe

pid	process
800	schtasks.exe
1432	schtasks.exe
216	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exeSppExtComObj.exe

pid	process
1124	fontreviewwinsvcrefPerfdll.exe
1124	fontreviewwinsvcrefPerfdll.exe
1124	fontreviewwinsvcrefPerfdll.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe
1376	SppExtComObj.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

fontreviewwinsvcrefPerfdll.exeSppExtComObj.exe

description pid process

Token: SeDebugPrivilege 1124 fontreviewwinsvcrefPerfdll.exe
Token: SeDebugPrivilege 1376 SppExtComObj.exe

description	pid	process
Token: SeDebugPrivilege	1124	fontreviewwinsvcrefPerfdll.exe
Token: SeDebugPrivilege	1376	SppExtComObj.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exeWScript.execmd.exefontreviewwinsvcrefPerfdll.execmd.exe

description	pid	process	target process
PID 980 wrote to memory of 4000	980	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 980 wrote to memory of 4000	980	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 980 wrote to memory of 4000	980	eda07f0921abe44f67eff44b1cfb5cfdb13529dc48243a01962c0ad5129d35f1.exe	WScript.exe
PID 4000 wrote to memory of 2156	4000	WScript.exe	cmd.exe
PID 4000 wrote to memory of 2156	4000	WScript.exe	cmd.exe
PID 4000 wrote to memory of 2156	4000	WScript.exe	cmd.exe
PID 2156 wrote to memory of 1124	2156	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 2156 wrote to memory of 1124	2156	cmd.exe	fontreviewwinsvcrefPerfdll.exe
PID 1124 wrote to memory of 4896	1124	fontreviewwinsvcrefPerfdll.exe	cmd.exe
PID 1124 wrote to memory of 4896	1124	fontreviewwinsvcrefPerfdll.exe	cmd.exe
PID 4896 wrote to memory of 4364	4896	cmd.exe	w32tm.exe
PID 4896 wrote to memory of 4364	4896	cmd.exe	w32tm.exe
PID 4896 wrote to memory of 1376	4896	cmd.exe	SppExtComObj.exe
PID 4896 wrote to memory of 1376	4896	cmd.exe	SppExtComObj.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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:980
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\fontreviewwinsvc\HZSUF0ENoqATgs2xuBB5SnvQ30qsZ.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4000
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\fontreviewwinsvc\JAvevGsJOHZ7p.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2156
  - - C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe
      "C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1124
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\36ugwHujKQ.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4896
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4364
      - C:\Windows\System32\aclui\SppExtComObj.exe
        
        "C:\Windows\System32\aclui\SppExtComObj.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1376

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\ProgramData\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\aclui\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\LanguagePackDiskCleanup\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:216

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

2

T1012

System Information Discovery

2

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:\Users\Admin\AppData\Local\Temp\36ugwHujKQ.bat

Filesize
206B

MD5
54d531a56e81deb8fa38daf40a9d9549

SHA1
87019361635a2792104dd792e14f9753409a6612

SHA256
da42a2eff55e23278f0f3ac1d198e0bd819e601f653a89be2132ff045207d56a

SHA512
76aff2791b7c50dcd2ed05f5263c0f5cf72d103637d59a441bcb13faabb07c725d052622228e72df331abd14dc59cae3a0728c870452592ac7bdb0321667ebea

Download Submit
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
C:\fontreviewwinsvc\fontreviewwinsvcrefPerfdll.exe

Filesize
1.0MB

MD5
193a3f45ff80ed77a5c041e5f1f1beb7

SHA1
7ff88a38ee281b02b7f5279d2cd801e647becd73

SHA256
03c5a982b0c3cd3144eaaff24b52a6480f4dc0680f0a006cf59f20565e7497ce

SHA512
20f067f2f552cd19f71519e86fc2b1f2dc7c31a7aa8c22400cba7a7a985b3c61ce659d1bfbf3762bb90ff451f8678d7c7d3a1c26f3280a9d7289c0fb8aa6218b

Download Submit
memory/1124-12-0x00007FFD2EDB3000-0x00007FFD2EDB5000-memory.dmp

Filesize
8KB

Download
memory/1124-13-0x0000000000F60000-0x000000000106C000-memory.dmp

Filesize
1.0MB

Download
memory/1376-29-0x0000000000C70000-0x0000000000C7C000-memory.dmp

Filesize
48KB

Download
memory/1376-30-0x0000000002440000-0x000000000244E000-memory.dmp

Filesize
56KB

Download
memory/1376-31-0x000000001B070000-0x000000001B078000-memory.dmp

Filesize
32KB

Download
memory/1376-32-0x0000000000C80000-0x0000000000C88000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads