dcrat | dfe9f39426e9f5c49dfd52ec6dcf91a679af24d2e5a6119a139b9bdf1525655d

General

Target

taskhostw.exe
Size

1.2MB
MD5

ac904ffc13b5f221270f475065687b59
SHA1

ed6b4383582eae7b72064a10e33cebc6fd3690e5
SHA256

963a316c03e4f88df946a43d537f6ed2d2001eaafcde40bdb52cd15104112606
SHA512

9626483209d8546c835c94cfffd89e1cf6ae813730d04dfdb9b4b4019e12ee0c9166fa76fb47426251f6e669d6c63037718ffb8c8366766cadca1a9f78c91559
SSDEEP

12288:URZ+IoG/n9IQxW3OBseUUT+tcYbqTHSOOJVu1SNEC8m+P1BAyrQ/ta3iruJtDwbD:u2G/nvxW3WieC2nOJVrj8m+aSDwbA9Nq

Score

10^/10

dcrat defense_evasion discovery infostealer 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 18 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	3020	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2764	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2908	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2676	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2584	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2244	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1684	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1200	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1048	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2616	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2940	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	580	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2936	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2984	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2036	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2044	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1100	3056	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3024	3056	schtasks.exe	35

UAC bypass 3 TTPs 6 IoCs

defense_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"	ComfontHost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ComfontHost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ComfontHost.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 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016ee0-11.dat	dcrat
behavioral1/memory/2856-13-0x0000000000050000-0x000000000013C000-memory.dmp	dcrat
behavioral1/memory/3040-35-0x0000000000BD0000-0x0000000000CBC000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2856	ComfontHost.exe
3040	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2776	cmd.exe
2776	cmd.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

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

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Reference Assemblies\WmiPrvSE.exe	ComfontHost.exe
File created	C:\Program Files\Reference Assemblies\24dbde2999530e	ComfontHost.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	taskhostw.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 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2764	schtasks.exe
2584	schtasks.exe
2244	schtasks.exe
2616	schtasks.exe
2936	schtasks.exe
3024	schtasks.exe
2908	schtasks.exe
2940	schtasks.exe
580	schtasks.exe
2984	schtasks.exe
2036	schtasks.exe
2044	schtasks.exe
3020	schtasks.exe
2676	schtasks.exe
1048	schtasks.exe
1100	schtasks.exe
1684	schtasks.exe
1200	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2856	ComfontHost.exe
2856	ComfontHost.exe
2856	ComfontHost.exe
2856	ComfontHost.exe
2856	ComfontHost.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe
3040	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2856	ComfontHost.exe
Token: SeDebugPrivilege	3040	csrss.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3048 wrote to memory of 2592	3048	taskhostw.exe	30
PID 3048 wrote to memory of 2592	3048	taskhostw.exe	30
PID 3048 wrote to memory of 2592	3048	taskhostw.exe	30
PID 3048 wrote to memory of 2592	3048	taskhostw.exe	30
PID 2592 wrote to memory of 2776	2592	WScript.exe	32
PID 2592 wrote to memory of 2776	2592	WScript.exe	32
PID 2592 wrote to memory of 2776	2592	WScript.exe	32
PID 2592 wrote to memory of 2776	2592	WScript.exe	32
PID 2776 wrote to memory of 2856	2776	cmd.exe	34
PID 2776 wrote to memory of 2856	2776	cmd.exe	34
PID 2776 wrote to memory of 2856	2776	cmd.exe	34
PID 2776 wrote to memory of 2856	2776	cmd.exe	34
PID 2856 wrote to memory of 836	2856	ComfontHost.exe	54
PID 2856 wrote to memory of 836	2856	ComfontHost.exe	54
PID 2856 wrote to memory of 836	2856	ComfontHost.exe	54
PID 836 wrote to memory of 2360	836	cmd.exe	56
PID 836 wrote to memory of 2360	836	cmd.exe	56
PID 836 wrote to memory of 2360	836	cmd.exe	56
PID 836 wrote to memory of 3040	836	cmd.exe	57
PID 836 wrote to memory of 3040	836	cmd.exe	57
PID 836 wrote to memory of 3040	836	cmd.exe	57

System policy modification 1 TTPs 6 IoCs

defense_evasion

Modify Registry

T1112

description	ioc	Process
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"	ComfontHost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	ComfontHost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	ComfontHost.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.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\taskhostw.exe
"C:\Users\Admin\AppData\Local\Temp\taskhostw.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3048
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\BlockBrowserWeb\73WPTP5CgKBkfusL13FoS1EalfC.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2592
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2776
  - - C:\BlockBrowserWeb\ComfontHost.exe
      "C:\BlockBrowserWeb\ComfontHost.exe"
      4⤵
      UAC bypass
      Executes dropped EXE
      Checks whether UAC is enabled
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      System policy modification
      PID:2856
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\1AEXzAt8Xq.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:836
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2360
      - C:\Users\Public\Pictures\Sample Pictures\csrss.exe
        
        "C:\Users\Public\Pictures\Sample Pictures\csrss.exe"
        6⤵
        UAC bypass
        Executes dropped EXE
        Checks whether UAC is enabled
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        System policy modification
        
        PID:3040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 6 /tr "'C:\Program Files\Reference Assemblies\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2584

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 14 /tr "'C:\Program Files\Reference Assemblies\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAPW" /sc MINUTE /mo 9 /tr "'C:\BlockBrowserWeb\WMIADAP.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAP" /sc ONLOGON /tr "'C:\BlockBrowserWeb\WMIADAP.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1200

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WMIADAPW" /sc MINUTE /mo 13 /tr "'C:\BlockBrowserWeb\WMIADAP.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1048

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 6 /tr "'C:\BlockBrowserWeb\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\BlockBrowserWeb\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 7 /tr "'C:\BlockBrowserWeb\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:580

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 9 /tr "'C:\Recovery\1b8b1de2-69f6-11ef-9774-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Pictures\Sample Pictures\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Public\Pictures\Sample Pictures\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Users\Public\Pictures\Sample Pictures\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

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

Replay Monitor

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Downloads

C:\BlockBrowserWeb\73WPTP5CgKBkfusL13FoS1EalfC.vbe

Filesize
230B

MD5
fdf72c94be3290267c930fab28fbd800

SHA1
a0e186ec44952baf296acd483f25327b0c6f33dd

SHA256
4eead935013d583296ca49f8fc8b70d38b7c32e1189204629f33cead574e2dd1

SHA512
a59b3fe649739e5d61d116149011f8d0f19ed8b217134aabb3f2c698dd52a5ccc4b67414209772be48fe4477158ffa7ebb2097280dccf1607955f1a95d264634

Download Submit
C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat

Filesize
47B

MD5
68411cfd82c251c57e0fd3e2b6e7af03

SHA1
26b09d13a90b0e662d57c59dc903db51dd11a177

SHA256
0f31379f24cbc2ab580f9b2f77e4fa36123a732377be53d88c28546228e106d7

SHA512
78ba2559d614ed0dbcc2e32a5f6b9ef3d3585df4cc515728ff4cccdefbd00b50f3e34774af016a5fc9f8320ff48e963bc76f9c7b04e80ad69a43eef9c18f2f2a

Download Submit
C:\Users\Admin\AppData\Local\Temp\1AEXzAt8Xq.bat

Filesize
215B

MD5
1098200bca1432237c0177d4e32cf051

SHA1
8b63020beb28e822b85c4f408809f227f342a3d0

SHA256
475dc03283643038dce71f07fd31021825d9af39d34647ef042bf799e095521a

SHA512
8e8cdacd94d34f653fcd0ff4e497a5ef36c1620bb34bdcab344ecc7d1786aea1964bb7f7cad97f01ec212d48d3223f0efb7728b0435d229510edfa5a879fab4e

Download Submit
\BlockBrowserWeb\ComfontHost.exe

Filesize
911KB

MD5
082141e65f26ececc48552790d6c6da4

SHA1
fba9667158632e2dbfa128d1fa1bd4be282e773a

SHA256
b49adf276a5e055ef1a3685f032701b41be76177f7f9eb85dfac2d33b5fa7c9f

SHA512
cbe0fef685801d436b5637a0e08df052af119284491a382d689686735ee8352d3edaa6857754f16f022a0bb43f95039bc841e4ed1e20614ea0a9976258947946

Download Submit
memory/2856-13-0x0000000000050000-0x000000000013C000-memory.dmp

Filesize
944KB

Download
memory/2856-14-0x00000000007B0000-0x00000000007BA000-memory.dmp

Filesize
40KB

Download
memory/2856-15-0x0000000001EF0000-0x0000000001EFC000-memory.dmp

Filesize
48KB

Download
memory/3040-35-0x0000000000BD0000-0x0000000000CBC000-memory.dmp

Filesize
944KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads