dcrat | d3a100c67a0ab27b0628df13e53b36999059981ffec20422b61a2801fc1f020a

Analysis

max time kernel
146s
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 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

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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	portreviewCommon.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	DCRatBuild.exe

Executes dropped EXE 2 IoCs

pid	Process
4284	portreviewCommon.exe
5112	portreviewCommon.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\CSC\explorer.exe	portreviewCommon.exe
File created	C:\Windows\Prefetch\ReadyBoot\TextInputHost.exe	portreviewCommon.exe
File created	C:\Windows\Prefetch\ReadyBoot\22eafd247d37c3	portreviewCommon.exe
File created	C:\Windows\Panther\actionqueue\dwm.exe	portreviewCommon.exe
File created	C:\Windows\Panther\actionqueue\6cb0b6c459d5d3	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	DCRatBuild.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 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	DCRatBuild.exe
Key created	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000_Classes\Local Settings	portreviewCommon.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe
4284	portreviewCommon.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
5112	portreviewCommon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4284	portreviewCommon.exe
Token: SeDebugPrivilege	5112	portreviewCommon.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3288 wrote to memory of 4120	3288	DCRatBuild.exe	82
PID 3288 wrote to memory of 4120	3288	DCRatBuild.exe	82
PID 3288 wrote to memory of 4120	3288	DCRatBuild.exe	82
PID 4120 wrote to memory of 1968	4120	WScript.exe	90
PID 4120 wrote to memory of 1968	4120	WScript.exe	90
PID 4120 wrote to memory of 1968	4120	WScript.exe	90
PID 1968 wrote to memory of 4284	1968	cmd.exe	92
PID 1968 wrote to memory of 4284	1968	cmd.exe	92
PID 4284 wrote to memory of 4312	4284	portreviewCommon.exe	93
PID 4284 wrote to memory of 4312	4284	portreviewCommon.exe	93
PID 4312 wrote to memory of 3120	4312	cmd.exe	95
PID 4312 wrote to memory of 3120	4312	cmd.exe	95
PID 4312 wrote to memory of 2344	4312	cmd.exe	96
PID 4312 wrote to memory of 2344	4312	cmd.exe	96
PID 4312 wrote to memory of 5112	4312	cmd.exe	97
PID 4312 wrote to memory of 5112	4312	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3288
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\HyperreviewWincommon\0APkIItdJuTMwiSED3qMQuncpJddgwxYvhrJ.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4120
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\HyperreviewWincommon\G389UpYDqsyTn8FeSKOfwJ022GejG1.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1968
  - - C:\HyperreviewWincommon\portreviewCommon.exe
      "C:\HyperreviewWincommon/portreviewCommon.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4284
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\I4Jy7rL30l.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4312
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:3120
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2344
      - C:\HyperreviewWincommon\portreviewCommon.exe
        
        "C:\HyperreviewWincommon\portreviewCommon.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:5112

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:708

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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\Microsoft\CLR_v4.0\UsageLogs\portreviewCommon.exe.log

Filesize
1KB

MD5
b9d0eb17ffb07da0a237d58c5f1c3933

SHA1
f2250d0f7deecb8d3e3a4a6bb5635aaeaa4d51d5

SHA256
e3601554efac51beb23c75dd8de6ed30cb3ddfcb1de508070dd7984f06d5ca05

SHA512
81b1d0aa1a269497943e79eabfc26b1165c2768a3b40f62e5e90f7d69fa4b7baa907e39ab18d8230222cd8e1248590918502b510ed94a89cb766d2d1cd25283a

Download Submit
C:\Users\Admin\AppData\Local\Temp\I4Jy7rL30l.bat

Filesize
220B

MD5
0d1aa10fb904bef5ff80b1165dd15b58

SHA1
e1eeb17b023c25a14f16c3a5591e3e889bd9d65d

SHA256
7b5c3ec3ea1f0442121a0f0c9bbfc741f7b1cea23c59ecca1904f55211c94737

SHA512
ec2c2cdc024744496df6dccf10c94551b27dfe2551e4832f9e98af23504d0cb53c30671091a02e124e73e6a7f2bf0eb5627533075a1a6b8206f2c7c9b6116458

Download Submit
memory/4284-13-0x0000000000F00000-0x00000000010F0000-memory.dmp

Filesize
1.9MB

Download
memory/4284-17-0x0000000003350000-0x000000000336C000-memory.dmp

Filesize
112KB

Download
memory/4284-18-0x000000001C110000-0x000000001C160000-memory.dmp

Filesize
320KB

Download
memory/4284-20-0x0000000003370000-0x0000000003388000-memory.dmp

Filesize
96KB

Download
memory/4284-22-0x0000000003390000-0x00000000033A8000-memory.dmp

Filesize
96KB

Download
memory/4284-24-0x00000000018E0000-0x00000000018EC000-memory.dmp

Filesize
48KB

Download
memory/4284-41-0x000000001C2A0000-0x000000001C349000-memory.dmp

Filesize
676KB

Download
memory/4284-15-0x00000000018C0000-0x00000000018CE000-memory.dmp

Filesize
56KB

Download
memory/4284-12-0x00007FFA0FAD3000-0x00007FFA0FAD5000-memory.dmp

Filesize
8KB

Download
memory/5112-50-0x000000001B960000-0x000000001BA09000-memory.dmp

Filesize
676KB

Download
memory/5112-58-0x000000001BD00000-0x000000001BD5A000-memory.dmp

Filesize
360KB

Download