dcrat | b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04

General

Target

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Size

912KB
MD5

ce162876a4c72ca0da4b96a16a5833ac
SHA1

c1e7998c66f153719672bbd1e7fe6103a12869c2
SHA256

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04
SHA512

1fe9474a4bfd6a4a74f8e4db88e4719ad6b1aa0a4efafc12e29a207ebc969284c96a276ad06e44ccd91f8f260f7e076c4b1a8d4504dd0ebd0d9017dbde1c4cd6
SSDEEP

24576:Sa3x1VStiA7iw63VboDAJDyL+qq+aWTIN+4e:Rswq63IEUj

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.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3000	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3860	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3732	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1112	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2272	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4468	2648	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5048	2648	schtasks.exe	82

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/memory/3044-1-0x0000000000920000-0x0000000000A0C000-memory.dmp	dcrat
behavioral2/files/0x0007000000023ca2-11.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

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

Executes dropped EXE 1 IoCs

Processes:

spoolsv.exe

pid	Process
3980	spoolsv.exe

Adds Run key to start application 2 TTPs 7 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\IMAPIv2-LegacyShim\\unsecapp.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\ksproxy\\spoolsv.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\upfc = "\"C:\\Windows\\InputMethod\\CHT\\upfc.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\C2RINTL.hr-hr\\OfficeClickToRun.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\PlayToReceiver\\RuntimeBroker.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SearchApp = "\"C:\\Windows\\SystemApps\\Microsoft.Windows.Search_cw5n1h2txyewy\\Search.Core\\SearchApp.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Common Files\\microsoft shared\\ClickToRun\\cpprestsdk\\OfficeClickToRun.exe\""	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

Drops file in System32 directory 6 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	ioc	Process
File created	C:\Windows\System32\wbem\IMAPIv2-LegacyShim\unsecapp.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\System32\wbem\IMAPIv2-LegacyShim\29c1c3cc0f76855c7e7456076a4ffc27e4947119	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\System32\ksproxy\spoolsv.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\System32\ksproxy\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\System32\PlayToReceiver\RuntimeBroker.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\System32\PlayToReceiver\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

Drops file in Program Files directory 4 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	ioc	Process
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\cpprestsdk\OfficeClickToRun.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\cpprestsdk\e6c9b481da804f07baff8eff543b0a1441069b5d	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.hr-hr\OfficeClickToRun.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.hr-hr\e6c9b481da804f07baff8eff543b0a1441069b5d	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

Drops file in Windows directory 5 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	ioc	Process
File opened for modification	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Search.Core\SearchApp.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Search.Core\38384e6a620884a6b69bcc56f80d556f9200171c	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\InputMethod\CHT\upfc.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\InputMethod\CHT\ea1d8f6d871115e19e634087152e4aa43b875a69	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Search.Core\SearchApp.exe	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
2272	schtasks.exe
4468	schtasks.exe
5048	schtasks.exe
3000	schtasks.exe
3860	schtasks.exe
3732	schtasks.exe
1112	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exespoolsv.exe

pid	Process
3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
3980	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exespoolsv.exe

description	pid	Process
Token: SeDebugPrivilege	3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
Token: SeDebugPrivilege	3980	spoolsv.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe

description	pid	Process	procid_target
PID 3044 wrote to memory of 3980	3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe	90
PID 3044 wrote to memory of 3980	3044	b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe	90

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\b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.exe
"C:\Users\Admin\AppData\Local\Temp\b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04.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:3044
- C:\Windows\System32\ksproxy\spoolsv.exe
  "C:\Windows\System32\ksproxy\spoolsv.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Search.Core\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\cpprestsdk\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\IMAPIv2-LegacyShim\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\ksproxy\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Windows\InputMethod\CHT\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2272

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.hr-hr\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\PlayToReceiver\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5048

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\InputMethod\CHT\upfc.exe

Filesize
912KB

MD5
ce162876a4c72ca0da4b96a16a5833ac

SHA1
c1e7998c66f153719672bbd1e7fe6103a12869c2

SHA256
b868e4ba796b5bb6cbf37136fa41fb1cdb4c4ac05187b11df98c05b053b51e04

SHA512
1fe9474a4bfd6a4a74f8e4db88e4719ad6b1aa0a4efafc12e29a207ebc969284c96a276ad06e44ccd91f8f260f7e076c4b1a8d4504dd0ebd0d9017dbde1c4cd6

Download Submit
memory/3044-0-0x00007FFFD20B3000-0x00007FFFD20B5000-memory.dmp

Filesize
8KB

Download
memory/3044-1-0x0000000000920000-0x0000000000A0C000-memory.dmp

Filesize
944KB

Download
memory/3044-4-0x00007FFFD20B0000-0x00007FFFD2B71000-memory.dmp

Filesize
10.8MB

Download
memory/3044-28-0x00007FFFD20B0000-0x00007FFFD2B71000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads