dcrat | dc83dbd12c5a432a6c168982e55d6c7be89dd0bc4b915e3e93e3a97c8af0ab0d

Analysis

max time kernel
141s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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	4948	2280	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1636	2280	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3280	2280	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1624	2280	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1684	2280	schtasks.exe	92
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3676	2280	schtasks.exe	92

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
3424	powershell.exe
784	powershell.exe

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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	BrokerhostNet.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	b5a1474fcb8f7b9809d52546bd304af3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
2676	BrokerhostNet.exe
4644	BrokerhostNet.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	b5a1474fcb8f7b9809d52546bd304af3.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-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	b5a1474fcb8f7b9809d52546bd304af3.exe
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	BrokerhostNet.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
4948	schtasks.exe
1636	schtasks.exe
3280	schtasks.exe
1624	schtasks.exe
1684	schtasks.exe
3676	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
2676	BrokerhostNet.exe
784	powershell.exe
3424	powershell.exe
784	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2676	BrokerhostNet.exe
Token: SeDebugPrivilege	784	powershell.exe
Token: SeDebugPrivilege	3424	powershell.exe
Token: SeDebugPrivilege	4644	BrokerhostNet.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 2500	2344	b5a1474fcb8f7b9809d52546bd304af3.exe	83
PID 2344 wrote to memory of 2500	2344	b5a1474fcb8f7b9809d52546bd304af3.exe	83
PID 2344 wrote to memory of 2500	2344	b5a1474fcb8f7b9809d52546bd304af3.exe	83
PID 2500 wrote to memory of 1892	2500	WScript.exe	85
PID 2500 wrote to memory of 1892	2500	WScript.exe	85
PID 2500 wrote to memory of 1892	2500	WScript.exe	85
PID 1892 wrote to memory of 2676	1892	cmd.exe	87
PID 1892 wrote to memory of 2676	1892	cmd.exe	87
PID 2676 wrote to memory of 784	2676	BrokerhostNet.exe	100
PID 2676 wrote to memory of 784	2676	BrokerhostNet.exe	100
PID 2676 wrote to memory of 3424	2676	BrokerhostNet.exe	101
PID 2676 wrote to memory of 3424	2676	BrokerhostNet.exe	101
PID 2676 wrote to memory of 1656	2676	BrokerhostNet.exe	104
PID 2676 wrote to memory of 1656	2676	BrokerhostNet.exe	104
PID 1656 wrote to memory of 2980	1656	cmd.exe	106
PID 1656 wrote to memory of 2980	1656	cmd.exe	106
PID 1656 wrote to memory of 2228	1656	cmd.exe	107
PID 1656 wrote to memory of 2228	1656	cmd.exe	107
PID 1656 wrote to memory of 4644	1656	cmd.exe	113
PID 1656 wrote to memory of 4644	1656	cmd.exe	113

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2344
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Bridgecontainerserver\VBxKsR3W5qREBSxxvIt5VpzoFdFFANtbsRk6NDfKSHeOxN7UsJds5Ck.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2500
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Bridgecontainerserver\SlMo.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1892
  - - C:\Bridgecontainerserver\BrokerhostNet.exe
      "C:\Bridgecontainerserver/BrokerhostNet.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2676
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Registry.exe'
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:784
    - - 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:3424
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Fo5pRBnfZA.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1656
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:2980
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2228
      - C:\Bridgecontainerserver\BrokerhostNet.exe
        
        "C:\Bridgecontainerserver\BrokerhostNet.exe"
        6⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:4644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\AppData\Local\Temp\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4948

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\AppData\Local\Temp\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerhostNetB" /sc MINUTE /mo 5 /tr "'C:\Bridgecontainerserver\BrokerhostNet.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1624

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:1684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "BrokerhostNetB" /sc MINUTE /mo 13 /tr "'C:\Bridgecontainerserver\BrokerhostNet.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3676

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

Replay Monitor

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Downloads

C:\Bridgecontainerserver\BrokerhostNet.exe

Filesize
1.9MB

MD5
0f91548ca49c64d6a8cd3846854f484c

SHA1
033c309b683020221ae189c4236a70c0d3ddd568

SHA256
a7883947a5f3c0d74f3eac6c2a6da45555298d769f5e3137e10a3ece14e83dfd

SHA512
e207b5545ceed034ec22f13e1a36f13656721b2c9cab97f6ec7ba8195f32ddc1673e1334902b2d4fc0ce393baf7f806bedf4a03a26a8ffe79ad17a87cf9a90a2

Download Submit
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\Microsoft\CLR_v4.0\UsageLogs\BrokerhostNet.exe.log

Filesize
1KB

MD5
af6acd95d59de87c04642509c30e81c1

SHA1
f9549ae93fdb0a5861a79a08f60aa81c4b32377b

SHA256
7521ee2d065a78efcab55a194fbd78492f84b70595f139263875f4ea92b194d6

SHA512
93ab99bcf588fde553de3240e0d2b0cbd4e4bc5ef5e99d53f45a267d7ff30103a80b5a7aa1c52d6eff1e070af0ec82d2c0b8aafb7099742aa16810edc1815c3a

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

Download Submit
C:\Users\Admin\AppData\Local\Temp\Fo5pRBnfZA.bat

Filesize
218B

MD5
3b6ec5ed07271dbf3129fed7d9434734

SHA1
1e8699864b1dcd36cf88cd00b0c535015a035f18

SHA256
71c9dc877322a66611c9ee31f9846d25c7f33b928d38274b40afb7b85cf3de86

SHA512
7ccaebcde2cf3103d252736aabdd8f31b94b6cd4a54ed6bf244b2f901667d03bfd2c43b3f679b404a05b72286f54bca1e7dc2fde10fb60d5756fa135ded42394

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_r5y2yssr.omi.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/784-38-0x000001BD71C20000-0x000001BD71C42000-memory.dmp

Filesize
136KB

Download
memory/2676-13-0x00000000003A0000-0x0000000000586000-memory.dmp

Filesize
1.9MB

Download
memory/2676-24-0x00000000026C0000-0x00000000026CC000-memory.dmp

Filesize
48KB

Download
memory/2676-22-0x00000000026B0000-0x00000000026BE000-memory.dmp

Filesize
56KB

Download
memory/2676-20-0x00000000026F0000-0x0000000002708000-memory.dmp

Filesize
96KB

Download
memory/2676-18-0x000000001B260000-0x000000001B2B0000-memory.dmp

Filesize
320KB

Download
memory/2676-17-0x00000000026D0000-0x00000000026EC000-memory.dmp

Filesize
112KB

Download
memory/2676-15-0x0000000000EF0000-0x0000000000EFE000-memory.dmp

Filesize
56KB

Download
memory/2676-12-0x00007FFC27A33000-0x00007FFC27A35000-memory.dmp

Filesize
8KB

Download
memory/4644-65-0x000000001DD60000-0x000000001DE75000-memory.dmp

Filesize
1.1MB

Download