dcrat | ec582f81548b3b5f12398a1a1f0dd30649a496304afad8bae13f82ac0849a983

General

Target

621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Size

912KB
MD5

10aed7c9078642756495f27e3b622a47
SHA1

d6aa65bb11cb728c38b472150e45d8ae4fe93711
SHA256

621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250
SHA512

fa12a498b9849769dfe10141faaf0414acc82c79fa935fbdae17e848bb60de6d4494b52cd31f9627ec18886b469ee85ec11b0d514b244442a9966e37d4146148
SSDEEP

12288:zwQRFBuIllEteYHMrYE6Oc+k1xdfatF0IaLHX8lO/MDFvNKqn4:zt4IUtwr6B+uxdfatG/TeFVK+4

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

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	2572	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2876	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1644	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1920	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5080	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3764	4952	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3648	4952	schtasks.exe	84

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3696-1-0x0000000000430000-0x000000000051C000-memory.dmp	dcrat
behavioral2/files/0x00070000000234ee-14.dat	dcrat

Checks computer location settings 2 TTPs 2 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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe

Executes dropped EXE 1 IoCs

pid	Process
4856	RuntimeBroker.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\backgroundTaskHost = "\"C:\\Documents and Settings\\backgroundTaskHost.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Program Files\\Internet Explorer\\es-ES\\OfficeClickToRun.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Windows\\System32\\GraphicsPerfSvc\\backgroundTaskHost.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Documents and Settings\\OfficeClickToRun.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Users\\Public\\Documents\\My Music\\services.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\prevhost\\RuntimeBroker.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\autotimesvc\\fontdrvhost.exe\""	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\GraphicsPerfSvc\eddb19405b7ce1152b3e19997f2b467f0b72b3d3	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Windows\System32\prevhost\RuntimeBroker.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File opened for modification	C:\Windows\System32\prevhost\RuntimeBroker.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Windows\System32\prevhost\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Windows\System32\autotimesvc\fontdrvhost.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Windows\System32\autotimesvc\5b884080fd4f94e2695da25c503f9e33b9605b83	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Windows\System32\GraphicsPerfSvc\backgroundTaskHost.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Internet Explorer\es-ES\OfficeClickToRun.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File opened for modification	C:\Program Files\Internet Explorer\es-ES\OfficeClickToRun.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Program Files\Internet Explorer\es-ES\e6c9b481da804f07baff8eff543b0a1441069b5d	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
File created	C:\Program Files\ModifiableWindowsApps\csrss.exe	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.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
1920	schtasks.exe
5080	schtasks.exe
3764	schtasks.exe
3648	schtasks.exe
2572	schtasks.exe
2876	schtasks.exe
1644	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3696	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
4856	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3696	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Token: SeDebugPrivilege	1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
Token: SeDebugPrivilege	4856	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3696 wrote to memory of 1420	3696	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe	90
PID 3696 wrote to memory of 1420	3696	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe	90
PID 1420 wrote to memory of 4856	1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe	94
PID 1420 wrote to memory of 4856	1420	621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe	94

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\621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
"C:\Users\Admin\AppData\Local\Temp\621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3696
- C:\Users\Admin\AppData\Local\Temp\621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe
  "C:\Users\Admin\AppData\Local\Temp\621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1420
- - C:\Windows\System32\prevhost\RuntimeBroker.exe
    "C:\Windows\System32\prevhost\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\es-ES\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\GraphicsPerfSvc\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Documents and Settings\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Users\Public\Documents\My Music\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\prevhost\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5080

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\autotimesvc\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Documents and Settings\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3648

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250.exe.log

Filesize
1KB

MD5
b7c0c43fc7804baaa7dc87152cdc9554

SHA1
1bab62bd56af745678d4e967d91e1ccfdeed4038

SHA256
46386a61f3aaf1b1c2e6efc9fc7e9e9ff16cd13ae58b8d856835771fedb6d457

SHA512
9fda3dd00a3406137e0113f13f78e77b20a76512b35820d38df696842cbbf2e2ebabfb99a3846c9637ecb54af858ec1551521187e379872973006426a253f769

Download Submit
C:\Windows\System32\prevhost\RuntimeBroker.exe

Filesize
912KB

MD5
10aed7c9078642756495f27e3b622a47

SHA1
d6aa65bb11cb728c38b472150e45d8ae4fe93711

SHA256
621f8b48e6cd5586e3dfb5f83a24998de6903a73e6c818ad663b036f0de93250

SHA512
fa12a498b9849769dfe10141faaf0414acc82c79fa935fbdae17e848bb60de6d4494b52cd31f9627ec18886b469ee85ec11b0d514b244442a9966e37d4146148

Download Submit
memory/3696-0-0x00007FFF9EEC3000-0x00007FFF9EEC5000-memory.dmp

Filesize
8KB

Download
memory/3696-1-0x0000000000430000-0x000000000051C000-memory.dmp

Filesize
944KB

Download
memory/3696-4-0x00007FFF9EEC0000-0x00007FFF9F981000-memory.dmp

Filesize
10.8MB

Download
memory/3696-13-0x00007FFF9EEC0000-0x00007FFF9F981000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads