dcrat | dc83dbd12c5a432a6c168982e55d6c7be89dd0bc4b915e3e93e3a97c8af0ab0d

Analysis

max time kernel
121s
max time network
149s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
16-12-2024 23:09

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General

Target

b5a1474fcb8f7b9809d52546bd304af3.exe
Size

2.2MB
MD5

b5a1474fcb8f7b9809d52546bd304af3
SHA1

8604fe586fa0d03adaa6608169a62c65c837de7d
SHA256

dc83dbd12c5a432a6c168982e55d6c7be89dd0bc4b915e3e93e3a97c8af0ab0d
SHA512

39931300c863c521957dd5d842c0c6e0d66d2b43663136375e21feb26181bd1c9d4494025e0e7a00b80b51405d1e67bfe825787e60c1b99998463b4e3a49a7ee
SSDEEP

49152:IBJVhKLUy2ich2Y+jCRZCH77sVccM50sF/CwsuVoM:y3hKPFch2YHgbucc00OdoM

Score

10^/10

dcrat discovery execution infostealer rat spyware stealer

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	2872	2652	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	2652	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2704	2652	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2216	2652	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1848	2652	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	2652	schtasks.exe	35

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2116	powershell.exe
2536	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2764	BrokerhostNet.exe
1972	cmd.exe

Loads dropped DLL 2 IoCs

pid	Process
2736	cmd.exe
2736	cmd.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
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	b5a1474fcb8f7b9809d52546bd304af3.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
2872	schtasks.exe
2624	schtasks.exe
2704	schtasks.exe
2216	schtasks.exe
1848	schtasks.exe
1816	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2764	BrokerhostNet.exe
2116	powershell.exe
2536	powershell.exe
1972	cmd.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2764	BrokerhostNet.exe
Token: SeDebugPrivilege	2116	powershell.exe
Token: SeDebugPrivilege	2536	powershell.exe
Token: SeDebugPrivilege	1972	cmd.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1528 wrote to memory of 2544	1528	b5a1474fcb8f7b9809d52546bd304af3.exe	30
PID 1528 wrote to memory of 2544	1528	b5a1474fcb8f7b9809d52546bd304af3.exe	30
PID 1528 wrote to memory of 2544	1528	b5a1474fcb8f7b9809d52546bd304af3.exe	30
PID 1528 wrote to memory of 2544	1528	b5a1474fcb8f7b9809d52546bd304af3.exe	30
PID 2544 wrote to memory of 2736	2544	WScript.exe	32
PID 2544 wrote to memory of 2736	2544	WScript.exe	32
PID 2544 wrote to memory of 2736	2544	WScript.exe	32
PID 2544 wrote to memory of 2736	2544	WScript.exe	32
PID 2736 wrote to memory of 2764	2736	cmd.exe	34
PID 2736 wrote to memory of 2764	2736	cmd.exe	34
PID 2736 wrote to memory of 2764	2736	cmd.exe	34
PID 2736 wrote to memory of 2764	2736	cmd.exe	34
PID 2764 wrote to memory of 2116	2764	BrokerhostNet.exe	42
PID 2764 wrote to memory of 2116	2764	BrokerhostNet.exe	42
PID 2764 wrote to memory of 2116	2764	BrokerhostNet.exe	42
PID 2764 wrote to memory of 2536	2764	BrokerhostNet.exe	43
PID 2764 wrote to memory of 2536	2764	BrokerhostNet.exe	43
PID 2764 wrote to memory of 2536	2764	BrokerhostNet.exe	43
PID 2764 wrote to memory of 1160	2764	BrokerhostNet.exe	46
PID 2764 wrote to memory of 1160	2764	BrokerhostNet.exe	46
PID 2764 wrote to memory of 1160	2764	BrokerhostNet.exe	46
PID 1160 wrote to memory of 1432	1160	cmd.exe	48
PID 1160 wrote to memory of 1432	1160	cmd.exe	48
PID 1160 wrote to memory of 1432	1160	cmd.exe	48
PID 1160 wrote to memory of 1268	1160	cmd.exe	49
PID 1160 wrote to memory of 1268	1160	cmd.exe	49
PID 1160 wrote to memory of 1268	1160	cmd.exe	49
PID 1160 wrote to memory of 1972	1160	cmd.exe	50
PID 1160 wrote to memory of 1972	1160	cmd.exe	50
PID 1160 wrote to memory of 1972	1160	cmd.exe	50

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\b5a1474fcb8f7b9809d52546bd304af3.exe
"C:\Users\Admin\AppData\Local\Temp\b5a1474fcb8f7b9809d52546bd304af3.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1528
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Bridgecontainerserver\VBxKsR3W5qREBSxxvIt5VpzoFdFFANtbsRk6NDfKSHeOxN7UsJds5Ck.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2544
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Bridgecontainerserver\SlMo.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2736
  - - C:\Bridgecontainerserver\BrokerhostNet.exe
      "C:\Bridgecontainerserver/BrokerhostNet.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2764
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\cmd.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2116
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Bridgecontainerserver\BrokerhostNet.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2536
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\9zwwBJzsu5.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1160
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:1432
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1268
      - C:\Users\Admin\AppData\Local\Temp\cmd.exe
        
        "C:\Users\Admin\AppData\Local\Temp\cmd.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1972

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\AppData\Local\Temp\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\AppData\Local\Temp\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerhostNetB" /sc MINUTE /mo 7 /tr "'C:\Bridgecontainerserver\BrokerhostNet.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerhostNet" /sc ONLOGON /tr "'C:\Bridgecontainerserver\BrokerhostNet.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1848

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerhostNetB" /sc MINUTE /mo 9 /tr "'C:\Bridgecontainerserver\BrokerhostNet.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Bridgecontainerserver\SlMo.bat

Filesize
89B

MD5
20c75fef4553c17d36635750cfb57049

SHA1
8489a5998acaa63326bc1a665c38eb71c5d1f426

SHA256
0dcef4794868f563d515bbeee69e35dde750411ee9dcaafdef597806c89cabd0

SHA512
2819f6585bd3ee7e9f1703c259b97b21dbacde276186a489acfea0c36f377f751845b50ed00a70e029e95f588193cf69f77aeaf2785e67888378b9f2e95ee92a

Download Submit
C:\Bridgecontainerserver\VBxKsR3W5qREBSxxvIt5VpzoFdFFANtbsRk6NDfKSHeOxN7UsJds5Ck.vbe

Filesize
204B

MD5
e52eec5fe59f0e73555c7d43c0035f62

SHA1
e6fcc87b7d260c2fcfff89e28e7d45357357520e

SHA256
b5712ce1aa870e16ed1464f1ecd627aed7020bb48c61252471cf9ec0b2d38d7f

SHA512
325c467e6519fb72238c62abbb7b89d32016a71416d41f148a38e41853928fc9cc84ed6b096784af9b1ad23c3363316d6b4f3464959127dfee1794cc926d40a7

Download Submit
C:\Users\Admin\AppData\Local\Temp\9zwwBJzsu5.bat

Filesize
217B

MD5
0f80b50f9f8258081d15675a81e95d44

SHA1
6b23dc629f616c5c2c40cbb9a98f7d3d9f708efe

SHA256
f0376edaa421607c666de8d4ed8283a6c3b4e2b93364d142b451170a1af8d5f5

SHA512
a80916c931f9f7ae4f573a56ae1f9273268b3cae054188e64c4cb1793eb145d91e275b0a7ada85878a7e8bcafc968172d15bd88c11e8492acc21b2c07fc27097

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
432841eb702a20215c919ce2ef86bffc

SHA1
e38781c027f45224dcd28a36373083f73f11e1af

SHA256
71a6820910be6a2aee410a44fa5f5c5e9b11d38289ebfb32fd556820a7cb0ef6

SHA512
1778c73fc701cbe882f9c241578821f76bfdf32ec78aada14b791d29af75babe022c7eaac26ed40e2417da94888b5b558ab8fb5e78e0ac585073a495293041a6

Download Submit
\Bridgecontainerserver\BrokerhostNet.exe

Filesize
1.9MB

MD5
0f91548ca49c64d6a8cd3846854f484c

SHA1
033c309b683020221ae189c4236a70c0d3ddd568

SHA256
a7883947a5f3c0d74f3eac6c2a6da45555298d769f5e3137e10a3ece14e83dfd

SHA512
e207b5545ceed034ec22f13e1a36f13656721b2c9cab97f6ec7ba8195f32ddc1673e1334902b2d4fc0ce393baf7f806bedf4a03a26a8ffe79ad17a87cf9a90a2

Download Submit
memory/1972-45-0x0000000000DA0000-0x0000000000F86000-memory.dmp

Filesize
1.9MB

Download
memory/2116-41-0x0000000002820000-0x0000000002828000-memory.dmp

Filesize
32KB

Download
memory/2116-40-0x000000001B630000-0x000000001B912000-memory.dmp

Filesize
2.9MB

Download
memory/2764-13-0x0000000000140000-0x0000000000326000-memory.dmp

Filesize
1.9MB

Download
memory/2764-23-0x00000000004A0000-0x00000000004AC000-memory.dmp

Filesize
48KB

Download
memory/2764-21-0x0000000000490000-0x000000000049E000-memory.dmp

Filesize
56KB

Download
memory/2764-19-0x00000000006D0000-0x00000000006E8000-memory.dmp

Filesize
96KB

Download
memory/2764-17-0x00000000004B0000-0x00000000004CC000-memory.dmp

Filesize
112KB

Download
memory/2764-15-0x0000000000370000-0x000000000037E000-memory.dmp

Filesize
56KB

Download