dcrat | ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50

Analysis

max time kernel
91s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-12-2024 03:44

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General

Target

ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe
Size

1.7MB
MD5

6697a39548b61fcfcf800b206bdbd696
SHA1

85229cee44c412c1f0f6a17562272a1296072815
SHA256

ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50
SHA512

6d0a4dc554e9df2fac49edbf8589e50e891481f6601c1a1e537d0c1243a8d7d873e54f84ccce04edd5346b50857f7601fafeb8856fc3e75d4283581071521572
SSDEEP

49152:IBJMrYgX9QdEa4gVH+pPnyBS8V6HU5NtvAWn2/x:yO3X9QVbIpavZ5NX8x

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

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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	Surrogatedll.exe

Executes dropped EXE 2 IoCs

pid	Process
4692	Surrogatedll.exe
1604	csrss.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows NT\TableTextService\en-US\886983d96e3d3e	Surrogatedll.exe
File created	C:\Program Files\Windows NT\TableTextService\en-US\csrss.exe	Surrogatedll.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	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
676	PING.EXE

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	Surrogatedll.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
676	PING.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe
4692	Surrogatedll.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4692	Surrogatedll.exe
Token: SeDebugPrivilege	1604	csrss.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 428 wrote to memory of 1424	428	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe	85
PID 428 wrote to memory of 1424	428	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe	85
PID 428 wrote to memory of 1424	428	ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe	85
PID 1424 wrote to memory of 3580	1424	WScript.exe	87
PID 1424 wrote to memory of 3580	1424	WScript.exe	87
PID 1424 wrote to memory of 3580	1424	WScript.exe	87
PID 3580 wrote to memory of 4692	3580	cmd.exe	89
PID 3580 wrote to memory of 4692	3580	cmd.exe	89
PID 4692 wrote to memory of 5088	4692	Surrogatedll.exe	90
PID 4692 wrote to memory of 5088	4692	Surrogatedll.exe	90
PID 5088 wrote to memory of 4044	5088	cmd.exe	92
PID 5088 wrote to memory of 4044	5088	cmd.exe	92
PID 5088 wrote to memory of 676	5088	cmd.exe	93
PID 5088 wrote to memory of 676	5088	cmd.exe	93
PID 5088 wrote to memory of 1604	5088	cmd.exe	104
PID 5088 wrote to memory of 1604	5088	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe
"C:\Users\Admin\AppData\Local\Temp\ff3ec61937bba7d0b4fd993698f3d2a8ba77e4630ed293e4a3e3d0254dc1de50.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:428
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\webCrt\gSYhm1mlqujwdrrg55.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1424
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\webCrt\bGFjXvZl1lSOMhHdLYZAxlDgwJSuyymnPovMq1RpYbZnEgpXBO1nwlMonY.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3580
  - - C:\webCrt\Surrogatedll.exe
      "C:\webCrt/Surrogatedll.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4692
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\CVkp3Lzwzf.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:5088
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:4044
      - C:\Windows\system32\PING.EXE
        
        ping -n 10 localhost
        6⤵
        System Network Configuration Discovery: Internet Connection Discovery
        Runs ping.exe
        
        PID:676
      - C:\Program Files\Windows NT\TableTextService\en-US\csrss.exe
        
        "C:\Program Files\Windows NT\TableTextService\en-US\csrss.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:1604

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\CVkp3Lzwzf.bat

Filesize
188B

MD5
c2c698bd89d2235acd0b5800283a3535

SHA1
2150495459c92859b5d73d9f49290f3be120ab8c

SHA256
956fb02ae6081bf8531131bc418b47f78acf85b7b720fd971ee72fbc6dc0dc56

SHA512
ffaebaedcf37c88794f658a88b828c410c657e2c8c6fdbb46c35003de866a393b2e29974da476ce4b6203e4e7e34a68c487c39366b4ec07f8bac5605589a8e38

Download Submit
C:\webCrt\Surrogatedll.exe

Filesize
1.8MB

MD5
9fc3ab56804d6ba50e840846783e8ac1

SHA1
ed6d70605ebe68934004c571a7f503b1432feb77

SHA256
13e5168099ca33f17c96a1f842ded5e99555d0aefed8e4f8efef96fbdcac7bba

SHA512
593bbd2ac3d0ac8a445d7cc7214e5f1a8aed2120ab098cbea2e3120a901480e707b45300a81e0e699a82342e516aff31c70026406b48d428d1a82e4d25db5de9

Download Submit
C:\webCrt\bGFjXvZl1lSOMhHdLYZAxlDgwJSuyymnPovMq1RpYbZnEgpXBO1nwlMonY.bat

Filesize
86B

MD5
94c4e83cdeb3852269278ef44dc2f811

SHA1
93f3f8aa1d9ebe13989beb442e06bfe708a6e375

SHA256
2b24e9c2ddbbbf496644f38cd4ec9a90d980af7c773f9617e8632f08a0182a0d

SHA512
8fbb0ef6de20e68aa47e912fddeea4ee2559db978f15033d6e3f7d5881fed735680d6746df8494471436e3abc0b6e2b478b1290beb1e4c29a2c3602e67322c97

Download Submit
C:\webCrt\gSYhm1mlqujwdrrg55.vbe

Filesize
242B

MD5
474ab11abe2a295e033dbc94baab19b2

SHA1
fc07a5e2f7246d11b9a06d5656fed8a99e0ca24e

SHA256
4eba79e794eac54029a51c2b8ad5a012f316bdc92e7ce8ef5018ef8ab726ea2b

SHA512
890c9867d3eb6d36ec87a135d204de4a6168b9b3de21f2fda6abd1cff99518e90698870f0d5a78cb97d785125090ddf78543473245dfc2e16b83620147dde910

Download Submit
memory/4692-12-0x00007FF840743000-0x00007FF840745000-memory.dmp

Filesize
8KB

Download
memory/4692-13-0x00000000003B0000-0x000000000058A000-memory.dmp

Filesize
1.9MB

Download
memory/4692-15-0x0000000002630000-0x000000000263E000-memory.dmp

Filesize
56KB

Download
memory/4692-17-0x000000001B2C0000-0x000000001B2DC000-memory.dmp

Filesize
112KB

Download
memory/4692-18-0x000000001B550000-0x000000001B5A0000-memory.dmp

Filesize
320KB

Download
memory/4692-20-0x000000001B500000-0x000000001B518000-memory.dmp

Filesize
96KB

Download
memory/4692-22-0x0000000002640000-0x000000000264C000-memory.dmp

Filesize
48KB

Download