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 9 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	3168	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3456	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1084	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2960	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1020	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3256	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1176	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4776	1872	schtasks.exe	81
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	648	1872	schtasks.exe	81

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

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x001b00000002aab3-10.dat	dcrat
behavioral1/memory/3940-13-0x0000000000380000-0x000000000046C000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
3940	ComfontHost.exe
1556	winlogon.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

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

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Mozilla Firefox\fonts\lsass.exe	ComfontHost.exe
File created	C:\Program Files\Mozilla Firefox\fonts\6203df4a6bafc7	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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskhostw.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings	ComfontHost.exe
Key created	\REGISTRY\USER\S-1-5-21-4249425805-3408538557-1766626484-1000_Classes\Local Settings	taskhostw.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

pid	Process
3256	schtasks.exe
1176	schtasks.exe
2960	schtasks.exe
1020	schtasks.exe
4776	schtasks.exe
648	schtasks.exe
3168	schtasks.exe
3456	schtasks.exe
1084	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
3940	ComfontHost.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe
1556	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3940	ComfontHost.exe
Token: SeDebugPrivilege	1556	winlogon.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2160 wrote to memory of 4944	2160	taskhostw.exe	77
PID 2160 wrote to memory of 4944	2160	taskhostw.exe	77
PID 2160 wrote to memory of 4944	2160	taskhostw.exe	77
PID 4944 wrote to memory of 2264	4944	WScript.exe	78
PID 4944 wrote to memory of 2264	4944	WScript.exe	78
PID 4944 wrote to memory of 2264	4944	WScript.exe	78
PID 2264 wrote to memory of 3940	2264	cmd.exe	80
PID 2264 wrote to memory of 3940	2264	cmd.exe	80
PID 3940 wrote to memory of 824	3940	ComfontHost.exe	91
PID 3940 wrote to memory of 824	3940	ComfontHost.exe	91
PID 824 wrote to memory of 2328	824	cmd.exe	93
PID 824 wrote to memory of 2328	824	cmd.exe	93
PID 824 wrote to memory of 1556	824	cmd.exe	94
PID 824 wrote to memory of 1556	824	cmd.exe	94

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\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"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	winlogon.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	winlogon.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
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2160
- 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:4944
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2264
  - - 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
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      System policy modification
      PID:3940
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\mqpLVJwWq1.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:824
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2328
      - C:\BlockBrowserWeb\winlogon.exe
        
        "C:\BlockBrowserWeb\winlogon.exe"
        6⤵
        UAC bypass
        Executes dropped EXE
        Checks whether UAC is enabled
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        System policy modification
        
        PID:1556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\BlockBrowserWeb\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3168

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\BlockBrowserWeb\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\BlockBrowserWeb\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Program Files\Mozilla Firefox\fonts\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2960

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\fonts\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Program Files\Mozilla Firefox\fonts\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 10 /tr "'C:\BlockBrowserWeb\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\BlockBrowserWeb\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\BlockBrowserWeb\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:648

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

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Downloads

C:\BlockBrowserWeb\73WPTP5CgKBkfusL13FoS1EalfC.vbe

Filesize
230B

MD5
fdf72c94be3290267c930fab28fbd800

SHA1
a0e186ec44952baf296acd483f25327b0c6f33dd

SHA256
4eead935013d583296ca49f8fc8b70d38b7c32e1189204629f33cead574e2dd1

SHA512
a59b3fe649739e5d61d116149011f8d0f19ed8b217134aabb3f2c698dd52a5ccc4b67414209772be48fe4477158ffa7ebb2097280dccf1607955f1a95d264634

Download Submit
C:\BlockBrowserWeb\ComfontHost.exe

Filesize
911KB

MD5
082141e65f26ececc48552790d6c6da4

SHA1
fba9667158632e2dbfa128d1fa1bd4be282e773a

SHA256
b49adf276a5e055ef1a3685f032701b41be76177f7f9eb85dfac2d33b5fa7c9f

SHA512
cbe0fef685801d436b5637a0e08df052af119284491a382d689686735ee8352d3edaa6857754f16f022a0bb43f95039bc841e4ed1e20614ea0a9976258947946

Download Submit
C:\BlockBrowserWeb\JLBdH8Facv2OZKr8pY7k2gD8clI.bat

Filesize
47B

MD5
68411cfd82c251c57e0fd3e2b6e7af03

SHA1
26b09d13a90b0e662d57c59dc903db51dd11a177

SHA256
0f31379f24cbc2ab580f9b2f77e4fa36123a732377be53d88c28546228e106d7

SHA512
78ba2559d614ed0dbcc2e32a5f6b9ef3d3585df4cc515728ff4cccdefbd00b50f3e34774af016a5fc9f8320ff48e963bc76f9c7b04e80ad69a43eef9c18f2f2a

Download Submit
C:\Users\Admin\AppData\Local\Temp\mqpLVJwWq1.bat

Filesize
196B

MD5
b2184a0aabdbb9b685b3e637c0f2a038

SHA1
6520d51c9f0a39d5c4a3defeeda0c52018014886

SHA256
0587bcc34e99fa1bdc33b786552b61a45736676b63915b02c28bef8ddcbef7b4

SHA512
827053edcf301647dab1ee36cec2468beea910575484c5381d87a72fbf1f64e3880cdc4e12c2e1b1ff5588ac35095c13d37e17d671e49130752cb606b87a940b

Download Submit
memory/1556-32-0x000000001C9F0000-0x000000001C9F9000-memory.dmp

Filesize
36KB

Download
memory/1556-31-0x000000001D300000-0x000000001D346000-memory.dmp

Filesize
280KB

Download
memory/1556-34-0x000000001D380000-0x000000001D39E000-memory.dmp

Filesize
120KB

Download
memory/1556-35-0x000000001D3A0000-0x000000001D3AB000-memory.dmp

Filesize
44KB

Download
memory/1556-33-0x000000001D370000-0x000000001D37D000-memory.dmp

Filesize
52KB

Download
memory/3940-12-0x00007FFF55633000-0x00007FFF55635000-memory.dmp

Filesize
8KB

Download
memory/3940-15-0x0000000000CD0000-0x0000000000CDC000-memory.dmp

Filesize
48KB

Download
memory/3940-14-0x0000000000CC0000-0x0000000000CCA000-memory.dmp

Filesize
40KB

Download
memory/3940-13-0x0000000000380000-0x000000000046C000-memory.dmp

Filesize
944KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads