dcrat | 9f746ed6aa449f3dc25209a9689c7426e001a52f8353bed2a5e9ff0a5c6c1d28

General

Target

Nursultancrack.exe
Size

1.3MB
MD5

1bd2ab6e5fee4a0a9ac63f586227f6d8
SHA1

18ebceae92af5dfa9603cf3994d385108563d154
SHA256

51794fd4a2cb80522e3696397317d59f92a169a73868434c714eabc535b297e4
SHA512

b6e903ad682e3ee8a1f8f2891950a9acd7c38d20699835f07a44001d86b9f07064a517d5fb75471ee535f5cf1f4368e8e524ef8fd8adcb3ebb952a121ce04a70
SSDEEP

24576:h2G/nvxW3WM0XNu4vGvrtqbgrEsIJKkLwR:hbA3E8z5ig

Score

10^/10

dcrat discovery infostealer 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 6 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	2504	1568	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4668	1568	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3004	1568	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4524	1568	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4316	1568	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4104	1568	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x000a000000023bb0-10.dat	dcrat
behavioral1/memory/2608-13-0x0000000000AD0000-0x0000000000BA6000-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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Nursultancrack.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	containerBrowserbroker.exe

Executes dropped EXE 2 IoCs

pid	Process
2608	containerBrowserbroker.exe
3100	sysmon.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	Nursultancrack.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 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	Nursultancrack.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4316	schtasks.exe
4104	schtasks.exe
2504	schtasks.exe
4668	schtasks.exe
3004	schtasks.exe
4524	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2608	containerBrowserbroker.exe
3100	sysmon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2608	containerBrowserbroker.exe
Token: SeDebugPrivilege	3100	sysmon.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3476 wrote to memory of 4920	3476	Nursultancrack.exe	83
PID 3476 wrote to memory of 4920	3476	Nursultancrack.exe	83
PID 3476 wrote to memory of 4920	3476	Nursultancrack.exe	83
PID 4920 wrote to memory of 1900	4920	WScript.exe	85
PID 4920 wrote to memory of 1900	4920	WScript.exe	85
PID 4920 wrote to memory of 1900	4920	WScript.exe	85
PID 1900 wrote to memory of 2608	1900	cmd.exe	87
PID 1900 wrote to memory of 2608	1900	cmd.exe	87
PID 2608 wrote to memory of 3100	2608	containerBrowserbroker.exe	96
PID 2608 wrote to memory of 3100	2608	containerBrowserbroker.exe	96

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\Nursultancrack.exe
"C:\Users\Admin\AppData\Local\Temp\Nursultancrack.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3476
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\HyperblockproviderReviewDriver\f1v9EK.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4920
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\HyperblockproviderReviewDriver\XnDji.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1900
  - - C:\HyperblockproviderReviewDriver\containerBrowserbroker.exe
      "C:\HyperblockproviderReviewDriver\containerBrowserbroker.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2608
    - - C:\Users\Admin\Videos\sysmon.exe
        
        "C:\Users\Admin\Videos\sysmon.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Saved Games\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Users\Admin\Saved Games\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\Saved Games\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3004

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Videos\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4524

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Users\Admin\Videos\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\Videos\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4104

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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:\HyperblockproviderReviewDriver\XnDji.bat

Filesize
62B

MD5
2d25c1f906313b346a700827ce2820f4

SHA1
23c322bf135782fc70b71d93c39f998217ec4f5a

SHA256
a977fefb4a29f7b29aa0bb3cc770df81ea2115e508d43933886f6a2756a85948

SHA512
7242c3e2690f0f34a80f64a9c331d86222cb9902efc415112c6f6d64d2f4ef75b685c7f07ace1ea4b14c11894a8bcd62a57c32305239402086b7742be727e36f

Download Submit
C:\HyperblockproviderReviewDriver\containerBrowserbroker.exe

Filesize
827KB

MD5
2371324ced34487eb0b06800e30e8f21

SHA1
393cc94f7f2c763e175eea6633ab615395a85c24

SHA256
d45c5f03cd284b47d3ea3025c12a48aa02f5b357f58f257d4dcc00cf21a16147

SHA512
a49c2d018a7112b249be760015841534daefe5c7cf92ede962029768a5159965f36c2e29f80ccd86b06eb2167e01f4abb69e83564c9a8fdba17156fc723dbf53

Download Submit
C:\HyperblockproviderReviewDriver\f1v9EK.vbe

Filesize
212B

MD5
b97b873d334f4917a72634127b0ac68b

SHA1
b87e0f9c5c714f5299fe68e40f7c08e6f4477e75

SHA256
85f9bd0c0ff712d8573d9a690b3e99fd6f10fafc6f50fcca86206d54546622b3

SHA512
3b6ec238436fae5809cd95b2c71f9944c96d53e1d967074c2833f9611becab5eb63f9890d9274ba8f421cffc245f26d6c6133aaba7d9c6e1025f58ad2ae0b63e

Download Submit
memory/2608-12-0x00007FF9FEF63000-0x00007FF9FEF65000-memory.dmp

Filesize
8KB

Download
memory/2608-13-0x0000000000AD0000-0x0000000000BA6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads