dcrat | d3a100c67a0ab27b0628df13e53b36999059981ffec20422b61a2801fc1f020a

Analysis

max time kernel
117s
max time network
151s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07-12-2024 14:53

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General

Target

DCRatBuild.exe
Size

2.2MB
MD5

42bebbc9ea503be1c3c78ac680e660bd
SHA1

ba7e6e6bdd1ff3fdbd66a6c25a180eaca08cb774
SHA256

d3a100c67a0ab27b0628df13e53b36999059981ffec20422b61a2801fc1f020a
SHA512

acf711b01b8fa27e487d6009644a7640197b44ff5efe6161670b4109b03c629c466c9411e56a51280b100494fd228123738320199cfe9763737dd98fadd13a4c
SSDEEP

49152:IBJo0KE3fGUa/34OEOnhHLe7kSb+e39EP9Xee:yC0KIGUaPh5ySP9Xee

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

Executes dropped EXE 2 IoCs

pid	Process
2940	portreviewCommon.exe
2160	System.exe

Loads dropped DLL 2 IoCs

pid	Process
2828	cmd.exe
2828	cmd.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\security\ApplicationId\csrss.exe	portreviewCommon.exe
File created	C:\Windows\security\ApplicationId\886983d96e3d3e	portreviewCommon.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DCRatBuild.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe
2940	portreviewCommon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2940	portreviewCommon.exe
Token: SeDebugPrivilege	2160	System.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2552 wrote to memory of 2804	2552	DCRatBuild.exe	30
PID 2552 wrote to memory of 2804	2552	DCRatBuild.exe	30
PID 2552 wrote to memory of 2804	2552	DCRatBuild.exe	30
PID 2552 wrote to memory of 2804	2552	DCRatBuild.exe	30
PID 2804 wrote to memory of 2828	2804	WScript.exe	31
PID 2804 wrote to memory of 2828	2804	WScript.exe	31
PID 2804 wrote to memory of 2828	2804	WScript.exe	31
PID 2804 wrote to memory of 2828	2804	WScript.exe	31
PID 2828 wrote to memory of 2940	2828	cmd.exe	33
PID 2828 wrote to memory of 2940	2828	cmd.exe	33
PID 2828 wrote to memory of 2940	2828	cmd.exe	33
PID 2828 wrote to memory of 2940	2828	cmd.exe	33
PID 2940 wrote to memory of 2360	2940	portreviewCommon.exe	34
PID 2940 wrote to memory of 2360	2940	portreviewCommon.exe	34
PID 2940 wrote to memory of 2360	2940	portreviewCommon.exe	34
PID 2360 wrote to memory of 1992	2360	cmd.exe	36
PID 2360 wrote to memory of 1992	2360	cmd.exe	36
PID 2360 wrote to memory of 1992	2360	cmd.exe	36
PID 2360 wrote to memory of 1800	2360	cmd.exe	37
PID 2360 wrote to memory of 1800	2360	cmd.exe	37
PID 2360 wrote to memory of 1800	2360	cmd.exe	37
PID 2360 wrote to memory of 2160	2360	cmd.exe	39
PID 2360 wrote to memory of 2160	2360	cmd.exe	39
PID 2360 wrote to memory of 2160	2360	cmd.exe	39

C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2552
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\HyperreviewWincommon\0APkIItdJuTMwiSED3qMQuncpJddgwxYvhrJ.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2804
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\HyperreviewWincommon\G389UpYDqsyTn8FeSKOfwJ022GejG1.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2828
  - - C:\HyperreviewWincommon\portreviewCommon.exe
      "C:\HyperreviewWincommon/portreviewCommon.exe"
      4⤵
      Executes dropped EXE
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2940
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\rnLiniMTTH.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2360
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:1992
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1800
      - C:\MSOCache\All Users\System.exe
        
        "C:\MSOCache\All Users\System.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:2160

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\HyperreviewWincommon\0APkIItdJuTMwiSED3qMQuncpJddgwxYvhrJ.vbe

Filesize
229B

MD5
7c1d3d422cc4568c9a4325d2409a748b

SHA1
a8079bf0f981b9f9936a2547a8807bdb27f9c9fe

SHA256
1cc02cd69855ad9f85fbf3c7b47d33687c0565ba65b845653bb449693a179b8e

SHA512
82adf7ecb692bc6a5a58eac8b0233a637b819c7623eebb1654336304b3f90cf28ab667b70e9d21b54663a521e2cd5fc4dd2d93234df40fe19bd3356d4be8d553

Download Submit
C:\HyperreviewWincommon\G389UpYDqsyTn8FeSKOfwJ022GejG1.bat

Filesize
109B

MD5
e7cad9e2e20d4e5ecf20c2001a0efa17

SHA1
b334bb6e63edfaf0641a13c4af036ee3da98306d

SHA256
cb179ab0ce771d571669600c2007065f4ee6921467294c02a213a9177efc4c44

SHA512
83329d1641230cb2fd2f056dc721b226869ab9c4ac305efb5dd3ff2e462b9be1a85d855593478405e7da36d141b312f4ebd35e2f741e2eb4e6bbb9e07932e88d

Download Submit
C:\HyperreviewWincommon\portreviewCommon.exe

Filesize
1.9MB

MD5
e28077697ca723b6f179b20f3827d0b8

SHA1
9d4aa3c95498559b9f56eacdf75312e9c1202c9f

SHA256
f266a8f40e42999a2c3d502b27af5d2872e672258e36d97da643730667794d55

SHA512
b085d8c27c11f89213b4b9b337705c2d2020e2885f3d466bcc666fb3ebd24e8d34c9bd323c398178423eecea3a9f7de2cc030b0b79989a8660d7b2a0e5b3ee44

Download Submit
C:\Users\Admin\AppData\Local\Temp\rnLiniMTTH.bat

Filesize
208B

MD5
4227455e951958b6d944fe65c64b54d1

SHA1
eba3c58e9e813a9041ddefbc011f00d7968f094b

SHA256
4cc0616a802a3105cf2e4d9cb57006a5a67d555fe204772f71c9673227ca14a0

SHA512
9c33bfb7f75905d98f83aa5a73091e61c08b33120a361438b2370d5f9b4e7e812aabb00b13d58e02da183c5735f0f7468ed87317d223600fa3d6955f787006d8

Download Submit
memory/2160-42-0x0000000000140000-0x0000000000330000-memory.dmp

Filesize
1.9MB

Download
memory/2940-13-0x0000000000900000-0x0000000000AF0000-memory.dmp

Filesize
1.9MB

Download
memory/2940-15-0x00000000003F0000-0x00000000003FE000-memory.dmp

Filesize
56KB

Download
memory/2940-17-0x00000000008E0000-0x00000000008FC000-memory.dmp

Filesize
112KB

Download
memory/2940-19-0x0000000002260000-0x0000000002278000-memory.dmp

Filesize
96KB

Download
memory/2940-21-0x0000000002280000-0x0000000002298000-memory.dmp

Filesize
96KB

Download
memory/2940-23-0x0000000000410000-0x000000000041C000-memory.dmp

Filesize
48KB

Download