dcrat | 3e8d98d5d75618970deccaeeae5e39123263ff22db1ae594b08dd4109828c7d1

Resubmissions

21-08-2024 01:30

240821-bw3pdsxcnq 10

21-08-2024 01:25

240821-bs432sxbjp 10

Analysis

max time kernel
58s
max time network
64s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
21-08-2024 01:25

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General

Target

dc/6.exe
Size

2.9MB
MD5

901347c38d0559eb5bf5bab62e6d2407
SHA1

34f7c5863b6d38a2c9fafcb0460d75a108b97512
SHA256

71f2a4f7f3abece865c8b648031a3a1cd8cb185b097ff232704307972c0141f1
SHA512

f9440261b64b46070d917d1fb8fbfae6ff4d201887c86a3b5c1d1561b4b5e88dc112b9aabbba234d422b02d76ff035ff95db70fca4acafca97b588eb32604701
SSDEEP

49152:UbA30pNm1SFq104+pXNhYaPr+igbvj+vPiNxU0qb00tfUFIdva:UbVSSF3Nsaj+z8PiuQ

Score

10^/10

dcrat discovery evasion infostealer rat trojan

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

Process spawned unexpected child process 6 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2436	4924	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4976	4924	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4480	4924	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4032	4924	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1968	4924	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5112	4924	schtasks.exe

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

wininit.exeportbroker.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	portbroker.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
C:\Webcrt\portbroker.exe	dcrat
behavioral13/memory/344-13-0x0000000000960000-0x0000000000C06000-memory.dmp	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

Processes:

6.exeWScript.exeportbroker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	6.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	portbroker.exe

Executes dropped EXE 2 IoCs

Processes:

portbroker.exewininit.exe

pid process

344 portbroker.exe
3468 wininit.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

portbroker.exewininit.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	portbroker.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	wininit.exe

Drops file in Program Files directory 2 IoCs

Processes:

portbroker.exe

description	ioc	process
File created	C:\Program Files\Windows NT\TextInputHost.exe	portbroker.exe
File created	C:\Program Files\Windows NT\22eafd247d37c3	portbroker.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

Processes:

WScript.execmd.exe6.exe

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	6.exe

Modifies registry class 1 IoCs

Processes:

6.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000_Classes\Local Settings 6.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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid process

2436 schtasks.exe
4976 schtasks.exe
4480 schtasks.exe
4032 schtasks.exe
1968 schtasks.exe
5112 schtasks.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000_Classes\Local Settings	6.exe

pid	process
2436	schtasks.exe
4976	schtasks.exe
4480	schtasks.exe
4032	schtasks.exe
1968	schtasks.exe
5112	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

portbroker.exewininit.exe

pid	process
344	portbroker.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe
3468	wininit.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

wininit.exe

pid process

3468 wininit.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

portbroker.exewininit.exe

description pid process

Token: SeDebugPrivilege 344 portbroker.exe
Token: SeDebugPrivilege 3468 wininit.exe

pid	process
3468	wininit.exe

description	pid	process
Token: SeDebugPrivilege	344	portbroker.exe
Token: SeDebugPrivilege	3468	wininit.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

6.exeWScript.execmd.exeportbroker.exe

description	pid	process	target process
PID 1784 wrote to memory of 1016	1784	6.exe	WScript.exe
PID 1784 wrote to memory of 1016	1784	6.exe	WScript.exe
PID 1784 wrote to memory of 1016	1784	6.exe	WScript.exe
PID 1016 wrote to memory of 3960	1016	WScript.exe	cmd.exe
PID 1016 wrote to memory of 3960	1016	WScript.exe	cmd.exe
PID 1016 wrote to memory of 3960	1016	WScript.exe	cmd.exe
PID 3960 wrote to memory of 344	3960	cmd.exe	portbroker.exe
PID 3960 wrote to memory of 344	3960	cmd.exe	portbroker.exe
PID 344 wrote to memory of 3468	344	portbroker.exe	wininit.exe
PID 344 wrote to memory of 3468	344	portbroker.exe	wininit.exe

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

Processes:

wininit.exeportbroker.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	portbroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	wininit.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	wininit.exe

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\dc\6.exe
"C:\Users\Admin\AppData\Local\Temp\dc\6.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1784
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Webcrt\x6psj9c6RDgdJEN.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1016
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Webcrt\jksxI0Jf41NNj.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3960
  - - C:\Webcrt\portbroker.exe
      "C:\Webcrt\portbroker.exe"
      4⤵
      UAC bypass
      Checks computer location settings
      Executes dropped EXE
      Checks whether UAC is enabled
      Drops file in Program Files directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      System policy modification
      PID:344
    - - C:\Recovery\WindowsRE\wininit.exe
        
        "C:\Recovery\WindowsRE\wininit.exe"
        5⤵
        UAC bypass
        Executes dropped EXE
        Checks whether UAC is enabled
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        System policy modification
        
        PID:3468

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2436

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4976

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows NT\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files\Windows NT\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1968

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows NT\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5112

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

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:\Webcrt\jksxI0Jf41NNj.bat

Filesize
26B

MD5
7ea9dfd9a49e4a20f9c9cc4e150e1351

SHA1
ad710f54515a6eeddce4b7f4d05b807edd3b53d5

SHA256
d2533863097a39b9bc0de4afcaad8dabab678901ddc903519d62a5fe2784d1d5

SHA512
a59fbb4c5b719959367dd814ee1bf7ab6f9c9baefeaa975a057fc3f532da5d69e66ef695616b9ac7cee5e5e01e8f665c55747c05724fe7ae518443e92f3e0ed9

Download Submit
C:\Webcrt\portbroker.exe

Filesize
2.6MB

MD5
440092cd483a7c102f86d3041a7872fa

SHA1
8d860fa9a4bed126f6f5a14e024eb55a1e98303b

SHA256
ad0b0b01c0a5d2feb02e59b366a1ddc9574dedda9e8e6249260a86debe8a4a6c

SHA512
1f65b8499ee074801809da51a54f164df9bae1475ebd04b9ea7afb3824da1869a5aac60d794de89ff47a853aef80fb46573dda5ddd894f9a676908c00fe3524a

Download Submit
C:\Webcrt\x6psj9c6RDgdJEN.vbe

Filesize
196B

MD5
1cd766665224c78545090b0d4ffb05f7

SHA1
702340dfd5963ebbe0d71774257a70337bd9045a

SHA256
720ddfa26c37d499c619ba4faadaec7295e91bb6bc9b74965bfab86af0285835

SHA512
b1625e6af6550846b350f4939067b068a2bc634848d1b0af9c1e69829a5bd99252b3ec5fec443abba1b2d7b462bccd345d91820f82931fa2ca83a9a3b7798243

Download Submit
memory/344-20-0x000000001B780000-0x000000001B788000-memory.dmp

Filesize
32KB

Download
memory/344-19-0x000000001B760000-0x000000001B776000-memory.dmp

Filesize
88KB

Download
memory/344-14-0x0000000001490000-0x000000000149E000-memory.dmp

Filesize
56KB

Download
memory/344-15-0x000000001B720000-0x000000001B73C000-memory.dmp

Filesize
112KB

Download
memory/344-16-0x000000001BDA0000-0x000000001BDF0000-memory.dmp

Filesize
320KB

Download
memory/344-18-0x000000001B750000-0x000000001B760000-memory.dmp

Filesize
64KB

Download
memory/344-17-0x000000001B740000-0x000000001B748000-memory.dmp

Filesize
32KB

Download
memory/344-12-0x00007FFD06283000-0x00007FFD06285000-memory.dmp

Filesize
8KB

Download
memory/344-21-0x000000001BF00000-0x000000001BF0A000-memory.dmp

Filesize
40KB

Download
memory/344-13-0x0000000000960000-0x0000000000C06000-memory.dmp

Filesize
2.6MB

Download
memory/344-22-0x000000001BDF0000-0x000000001BE46000-memory.dmp

Filesize
344KB

Download
memory/344-23-0x000000001BE40000-0x000000001BE48000-memory.dmp

Filesize
32KB

Download
memory/344-24-0x000000001BE50000-0x000000001BE62000-memory.dmp

Filesize
72KB

Download
memory/344-25-0x000000001C7D0000-0x000000001CCF8000-memory.dmp

Filesize
5.2MB

Download
memory/344-26-0x000000001BE80000-0x000000001BE88000-memory.dmp

Filesize
32KB

Download
memory/344-27-0x000000001BE90000-0x000000001BE98000-memory.dmp

Filesize
32KB

Download
memory/344-28-0x000000001BEA0000-0x000000001BEAC000-memory.dmp

Filesize
48KB

Download
memory/344-30-0x000000001BEC0000-0x000000001BECC000-memory.dmp

Filesize
48KB

Download
memory/344-29-0x000000001BEB0000-0x000000001BEBE000-memory.dmp

Filesize
56KB

Download
memory/344-31-0x000000001BED0000-0x000000001BEDA000-memory.dmp

Filesize
40KB

Download