dcrat | 7f3ab101faf2bdfa164b1884ede53aface5c1ae6c28f4464b9750f9d31c43fcd

General

Target

Verify_advanced_encrypted.exe
Size

25KB
MD5

937c41f1b4d53bca113f2aaf35985939
SHA1

422a01bf2701ac7c9f7dcbfc51b974544daadde3
SHA256

7f3ab101faf2bdfa164b1884ede53aface5c1ae6c28f4464b9750f9d31c43fcd
SHA512

9473795303b12419640783069bfe876d1dced371aedd632f8ff2f732acce06efa99df880e7aeaec29c20526f41b2193d671b9e0a2560d3503e66d9dccf78a8ac
SSDEEP

384:NaBkyPgdGJ3Ja7PXGcgGjsxxX5Hs0JxlA/1yBmDpTOOze3jFaJGiK2nLi7joK3MC:JYgg0ULM0K9SOzMWGrGi7joK3v

Score

10^/10

dcrat discovery 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

DCRat payload 1 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/files/0x0007000000023cb0-19.dat	dcrat

Downloads MZ/PE file

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:

RarExtPackage.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	RarExtPackage.exe

Executes dropped EXE 2 IoCs

Processes:

RarExtPackage.exeDiscord.exe

pid	Process
1460	RarExtPackage.exe
1440	Discord.exe

Modifies WinLogon 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

Verify_advanced_encrypted.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SystemConfig = "C:\\Program Files\\WinRAR\\RarExtPackage.exe"	Verify_advanced_encrypted.exe

Drops file in Program Files directory 1 IoCs

Processes:

Verify_advanced_encrypted.exe

description	ioc	Process
File created	C:\Program Files\WinRAR\RarExtPackage.exe	Verify_advanced_encrypted.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 2 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

Processes:

RarExtPackage.exeWScript.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RarExtPackage.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

Processes:

RarExtPackage.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	RarExtPackage.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

Discord.exe

pid	Process
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe
1440	Discord.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Discord.exe

description	pid	Process
Token: SeDebugPrivilege	1440	Discord.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Verify_advanced_encrypted.exeRarExtPackage.exe

description	pid	Process	procid_target
PID 4704 wrote to memory of 1460	4704	Verify_advanced_encrypted.exe	86
PID 4704 wrote to memory of 1460	4704	Verify_advanced_encrypted.exe	86
PID 4704 wrote to memory of 1460	4704	Verify_advanced_encrypted.exe	86
PID 1460 wrote to memory of 2992	1460	RarExtPackage.exe	90
PID 1460 wrote to memory of 2992	1460	RarExtPackage.exe	90
PID 1460 wrote to memory of 2992	1460	RarExtPackage.exe	90
PID 4704 wrote to memory of 1440	4704	Verify_advanced_encrypted.exe	92
PID 4704 wrote to memory of 1440	4704	Verify_advanced_encrypted.exe	92

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\Verify_advanced_encrypted.exe
"C:\Users\Admin\AppData\Local\Temp\Verify_advanced_encrypted.exe"
1⤵
- Modifies WinLogon
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
PID:4704
- C:\Program Files\WinRAR\RarExtPackage.exe
  "C:\Program Files\WinRAR\RarExtPackage.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1460
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Chrome\9gF866gX.vbe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2992
- C:\Users\Admin\AppData\Local\Temp\Discord.exe
  C:\Users\Admin\AppData\Local\Temp\Discord.exe
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1440

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

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:\Program Files\WinRAR\RarExtPackage.exe

Filesize
1.1MB

MD5
ec88bc94b1144c2c56d0a2d629856c05

SHA1
41abf0acfdd3e70bbd34e808ef576e3a8ca7351a

SHA256
fcf21eb97245661c8cb307a80f499c78b427b930c4c39066a9ab4113ab17ce07

SHA512
ce0639f732e4c17224be5a656164e0e04ab05a07578893ff92b3d9d487970d710c936a0c3d72efe6869e8783cd53b433bcdff9e24dace514940b0417f5e0697b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Discord.exe

Filesize
270KB

MD5
daef03c6a3b69a0a7bd267625950e6fe

SHA1
d12b3ac41906d0e24eff0f79da4777af632f5d97

SHA256
2f4f6f07426c34632ead288850bc2255e4d920dd18d28ced9a776830bacdf931

SHA512
d891b4b63c097cdd6f8b93478e64fe7b4d86ba509136223bc45d4b588d75da642347911084d0725c3436acb65b68b0ae5f987449d672fe3ddd8b09b625de494f

Download Submit
C:\Users\Admin\AppData\Roaming\Chrome\9gF866gX.vbe

Filesize
219B

MD5
6efb47109d1485e1b27493aee6f3384d

SHA1
68c95e99965433916c008fd64f33ddb10c0e9b2c

SHA256
9796ee42ab68884385418febb48d0268e717c40c0b095df89b991c1ee5974f40

SHA512
4827993024bb3e0406b55098180b94239bc098182c12991f541cec3d8e512870eb0407671f7dbc28f5d36d0a55a48e673618efc1b2196b8547f6d5e7b38f4dd9

Download Submit
memory/1440-36-0x0000024CB32B0000-0x0000024CB32FA000-memory.dmp

Filesize
296KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads