dcrat | a6b8cff0d4cc4edc063ce8bb8cddd0bd5b14c7e6a1f6ca4859dabca6f953af90

General

Target

5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe
Size

2.3MB
MD5

5ea10818a7aa9cb88ac1f17cc5e86989
SHA1

d253771029ab507d7c64642f6586831305a62a2c
SHA256

5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27
SHA512

e3c942832460f6f6ddfe3d0a0a7afa903193bf4b07a3c702d52e7314769f72839bb3096c9dff68bdd26a9cf5c195f49e6f08c468f6499e6de1d784893db8ba3f
SSDEEP

49152:UbA30uCU+RsTSd6BGz+ASnjx3xUPJyP9nTuD:UbBvuxwzxSjLS3D

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 6 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		3164	schtasks.exe
		2340	schtasks.exe
		4560	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe
		1432	schtasks.exe
		2064	schtasks.exe

Process spawned unexpected child process 5 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	1432	224	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2064	224	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3164	224	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2340	224	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4560	224	schtasks.exe	92

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023436-10.dat	dcrat
behavioral2/memory/5076-13-0x0000000000480000-0x000000000068C000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	driverruntimereviewwinbroker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
5076	driverruntimereviewwinbroker.exe
4412	unsecapp.exe

Adds Run key to start application 2 TTPs 5 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\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\AppVOrchestration\\OfficeClickToRun.exe\""	driverruntimereviewwinbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\Speech_OneCore\\Engines\\TTS\\RuntimeBroker.exe\""	driverruntimereviewwinbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\TrustedSignalCredProv\\lsass.exe\""	driverruntimereviewwinbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\dimsroam\\unsecapp.exe\""	driverruntimereviewwinbroker.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\inseng\\fontdrvhost.exe\""	driverruntimereviewwinbroker.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\TrustedSignalCredProv\lsass.exe	driverruntimereviewwinbroker.exe
File created	C:\Windows\System32\TrustedSignalCredProv\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	driverruntimereviewwinbroker.exe
File created	C:\Windows\System32\wbem\dimsroam\unsecapp.exe	driverruntimereviewwinbroker.exe
File created	C:\Windows\System32\wbem\dimsroam\29c1c3cc0f76855c7e7456076a4ffc27e4947119	driverruntimereviewwinbroker.exe
File created	C:\Windows\System32\inseng\fontdrvhost.exe	driverruntimereviewwinbroker.exe
File created	C:\Windows\System32\inseng\5b884080fd4f94e2695da25c503f9e33b9605b83	driverruntimereviewwinbroker.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\OfficeClickToRun.exe	driverruntimereviewwinbroker.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\OfficeClickToRun.exe	driverruntimereviewwinbroker.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\e6c9b481da804f07baff8eff543b0a1441069b5d	driverruntimereviewwinbroker.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Speech_OneCore\Engines\TTS\RuntimeBroker.exe	driverruntimereviewwinbroker.exe
File created	C:\Windows\Speech_OneCore\Engines\TTS\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	driverruntimereviewwinbroker.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	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.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

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	driverruntimereviewwinbroker.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1432	schtasks.exe
2064	schtasks.exe
3164	schtasks.exe
2340	schtasks.exe
4560	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5076	driverruntimereviewwinbroker.exe
4412	unsecapp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5076	driverruntimereviewwinbroker.exe
Token: SeDebugPrivilege	4412	unsecapp.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4048 wrote to memory of 2676	4048	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe	86
PID 4048 wrote to memory of 2676	4048	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe	86
PID 4048 wrote to memory of 2676	4048	5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe	86
PID 2676 wrote to memory of 4388	2676	WScript.exe	93
PID 2676 wrote to memory of 4388	2676	WScript.exe	93
PID 2676 wrote to memory of 4388	2676	WScript.exe	93
PID 4388 wrote to memory of 5076	4388	cmd.exe	95
PID 4388 wrote to memory of 5076	4388	cmd.exe	95
PID 5076 wrote to memory of 1664	5076	driverruntimereviewwinbroker.exe	101
PID 5076 wrote to memory of 1664	5076	driverruntimereviewwinbroker.exe	101
PID 1664 wrote to memory of 932	1664	cmd.exe	103
PID 1664 wrote to memory of 932	1664	cmd.exe	103
PID 1664 wrote to memory of 4412	1664	cmd.exe	107
PID 1664 wrote to memory of 4412	1664	cmd.exe	107

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\5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe
"C:\Users\Admin\AppData\Local\Temp\5936b1537b180e8f610f37000936fe1c8979d63616c3131ad1afe33a2c096a27.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4048
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\driverruntime\g3T3MhMW2xzvlh0A.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2676
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\driverruntime\MdhUpHLszPTunt5Up4v.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4388
  - - C:\driverruntime\driverruntimereviewwinbroker.exe
      "C:\driverruntime\driverruntimereviewwinbroker.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Program Files directory
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:5076
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ejbDvd7gM2.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1664
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:932
      - C:\Windows\System32\wbem\dimsroam\unsecapp.exe
        
        "C:\Windows\System32\wbem\dimsroam\unsecapp.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4412

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\Speech_OneCore\Engines\TTS\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\TrustedSignalCredProv\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3164

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\dimsroam\unsecapp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\inseng\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4560

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\ejbDvd7gM2.bat

Filesize
210B

MD5
17a6e1b210c4c3cf297ac1293b93a3e7

SHA1
51baa5e5f6b77ca03dc5290db8b1d9a4384a6f61

SHA256
b5cfd897b3aa374f1967e10834e480182e31c79adce426358e8f5b2bc28c89bd

SHA512
3967bc028561c50dec5835a8c48fa80c7d8260614a51a5acd08aea33f62b1cc3680b7bdab9741ede2751a75cdf10acfed77c94094aecdf41f5fdaeeee66a91cc

Download Submit
C:\driverruntime\MdhUpHLszPTunt5Up4v.bat

Filesize
51B

MD5
eaa874ab241fd40826c737c1a3b0f3df

SHA1
f2f41d0951603bf869076eae8c0d98a11a44c297

SHA256
3f0b3977d065cc7ec8939745001b7dc67cfc3f34b7e87e1d54478e6e213fa82f

SHA512
4956b8bb8baa3f64ca0436a6974f719e656afb1b520dcd40eb6242eaba52d4031fe50e1eaf24db51925d28aaad4e52f3b61c2969d356703b1729c2be72b50913

Download Submit
C:\driverruntime\driverruntimereviewwinbroker.exe

Filesize
2.0MB

MD5
a0e3c525ca39f040503976ed5e2400f2

SHA1
bfe9da78b0643b51193b8710d15d1bd5ea1386a4

SHA256
cf7c599a186ce0aef6b817e0134c129f5672b325064c0e742b742f792fd4991b

SHA512
96404838178ec94bb3dde32765961d1ce52a6f9d30765dbf3274d35371263848e10e9aaffdfd740077d60c769594ba92011ff2541599b7a67f0178fa93949e28

Download Submit
C:\driverruntime\g3T3MhMW2xzvlh0A.vbe

Filesize
209B

MD5
e4e82fb77d90ca4a807612b8f64fe0fe

SHA1
13735e175978dc40037eb7e9de54d403730ceecf

SHA256
aaee0f50f9f20338e6bbf9eeea524283d5149505e9def2a9b26172f8f4f8136e

SHA512
9853dccc0b32ed12f17a21b3fe76fd3f8297ce6d9798b59a31defc9643793c1ad9363928dec74f2c9eca917ff1a32430e673887db5e42d3d4defee1b3f578638

Download Submit
memory/4412-34-0x00000000014B0000-0x00000000014BC000-memory.dmp

Filesize
48KB

Download
memory/4412-35-0x00000000014D0000-0x00000000014DC000-memory.dmp

Filesize
48KB

Download
memory/4412-36-0x0000000002EE0000-0x0000000002F36000-memory.dmp

Filesize
344KB

Download
memory/4412-37-0x00000000014C0000-0x00000000014CA000-memory.dmp

Filesize
40KB

Download
memory/5076-12-0x00007FFA69883000-0x00007FFA69885000-memory.dmp

Filesize
8KB

Download
memory/5076-13-0x0000000000480000-0x000000000068C000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads