dcrat | 705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

General

Target

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Size

547KB
MD5

637920e868b2367c5e6517ee4744d3c9
SHA1

09f66f5db717cf9df695bb89d8e2643229379969
SHA256

705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622
SHA512

92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443
SSDEEP

12288:xqnO30tV2lZu09sR2ia1OgdDG3cSIksYEkQlrBt:x+O3rvZDiUx5r

Score

10^/10

dcrat 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 7 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	1088	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2196	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	396	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3480	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3824	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	4412	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3508	4412	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3100-1-0x0000000000180000-0x0000000000210000-memory.dmp	dcrat
behavioral2/files/0x000a000000023baa-11.dat	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Executes dropped EXE 1 IoCs

pid	Process
4408	taskhostw.exe

Adds Run key to start application 2 TTPs 7 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\taskhostw = "\"C:\\Windows\\System32\\mfAACEnc\\taskhostw.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\Setup\\State\\smss.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\SettingsHandlers_SpeechPrivacy\\backgroundTaskHost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:\\Windows\\SystemApps\\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\\InputApp\\InputApp\\TextInputHost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\StartMenuExperienceHost = "\"C:\\PerfLogs\\StartMenuExperienceHost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\AppVOrchestration\\OfficeClickToRun.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Documents and Settings\\fontdrvhost.exe\""	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\System32\mfAACEnc\taskhostw.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\mfAACEnc\ea9f0e6c9e2dcd4dfacdaf29ba21541fb815a988	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\SettingsHandlers_SpeechPrivacy\backgroundTaskHost.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\System32\SettingsHandlers_SpeechPrivacy\eddb19405b7ce1152b3e19997f2b467f0b72b3d3	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.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	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File opened for modification	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\OfficeClickToRun.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVOrchestration\e6c9b481da804f07baff8eff543b0a1441069b5d	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\Setup\State\69ddcba757bf72f7d36c464c71f42baab150b2b9	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\InputApp\TextInputHost.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\InputApp\22eafd247d37c30fed3795ee41d259ec72bb351c	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
File created	C:\Windows\Setup\State\smss.exe	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3824	schtasks.exe
2660	schtasks.exe
3508	schtasks.exe
1088	schtasks.exe
2196	schtasks.exe
396	schtasks.exe
3480	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3100	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
4408	taskhostw.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3100	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
Token: SeDebugPrivilege	4408	taskhostw.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3100 wrote to memory of 4408	3100	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	91
PID 3100 wrote to memory of 4408	3100	705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe	91

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\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe
"C:\Users\Admin\AppData\Local\Temp\705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3100
- C:\Windows\System32\mfAACEnc\taskhostw.exe
  "C:\Windows\System32\mfAACEnc\taskhostw.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4408

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⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1088

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Documents and Settings\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2196

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Windows\System32\mfAACEnc\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\Setup\State\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\SettingsHandlers_SpeechPrivacy\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3824

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\InputApp\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\PerfLogs\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3508

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SettingsHandlers_SpeechPrivacy\backgroundTaskHost.exe

Filesize
547KB

MD5
637920e868b2367c5e6517ee4744d3c9

SHA1
09f66f5db717cf9df695bb89d8e2643229379969

SHA256
705e9214debeb58fba4ec0bf3cea5a08df142f5bbde6d4b82b6646cf3f2a6622

SHA512
92846cd4ee57c2be2c5146692defab8f5b4cb58eed5f44ba13b3aa36f537f8454090929618f4ec9104ee90cba8af9aa2340f89dac3ec3d488f30682af2760443

Download Submit
memory/3100-0-0x00007FFA81103000-0x00007FFA81105000-memory.dmp

Filesize
8KB

Download
memory/3100-1-0x0000000000180000-0x0000000000210000-memory.dmp

Filesize
576KB

Download
memory/3100-4-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/3100-28-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/4408-29-0x0000000001760000-0x000000000176C000-memory.dmp

Filesize
48KB

Download
memory/4408-31-0x00000000017A0000-0x00000000017AE000-memory.dmp

Filesize
56KB

Download
memory/4408-30-0x0000000001770000-0x000000000177C000-memory.dmp

Filesize
48KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads