dcrat | 17911103687aab297d51b99468b26da38ea4331c6b7c5d2fe36d33c066f7b076

Analysis

max time kernel
137s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
26/12/2023, 00:04

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General

Target

450db4964978e42ce9403a9dd174586a.exe
Size

505KB
MD5

450db4964978e42ce9403a9dd174586a
SHA1

2ea8411c00fd913b54c0ec19824beee5a3256a9c
SHA256

17911103687aab297d51b99468b26da38ea4331c6b7c5d2fe36d33c066f7b076
SHA512

59cdd260f0348ae5eaa966e70d3751553021c1e025c5c9442b9d606acee7f6aba4a3e4db394931228ebe22c2fa0377eaa856d77d9d97d6254c7aece5ff443482
SSDEEP

12288:rs9sZu3LQWKvXcCf4G3yXFUajm4aqYDHdstYKnKMHClGX:rcNqkCfNGFUa1aqYDHdstPT

Score

10^/10

dcrat 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 payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000f000000023163-7.dat	dcrat
behavioral2/memory/4352-28-0x0000000000B80000-0x0000000000C2A000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	WindowsProtect.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	reviewWinMonitornetwinref.exe

Executes dropped EXE 3 IoCs

pid	Process
4644	WindowsProtect.exe
4352	reviewWinMonitornetwinref.exe
2780	spoolsv.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\System32\iasacct\conhost.exe	reviewWinMonitornetwinref.exe
File opened for modification	C:\Windows\System32\iasacct\conhost.exe	reviewWinMonitornetwinref.exe
File created	C:\Windows\System32\iasacct\088424020bedd6b28ac7fd22ee35dcd7322895ce	reviewWinMonitornetwinref.exe
File created	C:\Windows\System32\WerEnc\spoolsv.exe	reviewWinMonitornetwinref.exe
File created	C:\Windows\System32\WerEnc\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	reviewWinMonitornetwinref.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 4 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
4652	schtasks.exe
3332	schtasks.exe
3412	schtasks.exe
1852	schtasks.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000_Classes\Local Settings	WindowsProtect.exe
Key created	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000_Classes\Local Settings	reviewWinMonitornetwinref.exe
Key created	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000_Classes\Local Settings	Process not Found

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4376	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4352	reviewWinMonitornetwinref.exe
4352	reviewWinMonitornetwinref.exe
2780	spoolsv.exe
2780	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4352	reviewWinMonitornetwinref.exe
Token: SeDebugPrivilege	2780	spoolsv.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 4644	4332	Process not Found	93
PID 4332 wrote to memory of 4644	4332	Process not Found	93
PID 4332 wrote to memory of 4644	4332	Process not Found	93
PID 4332 wrote to memory of 2828	4332	Process not Found	92
PID 4332 wrote to memory of 2828	4332	Process not Found	92
PID 4332 wrote to memory of 2828	4332	Process not Found	92
PID 4644 wrote to memory of 456	4644	WindowsProtect.exe	94
PID 4644 wrote to memory of 456	4644	WindowsProtect.exe	94
PID 4644 wrote to memory of 456	4644	WindowsProtect.exe	94
PID 456 wrote to memory of 2956	456	WScript.exe	101
PID 456 wrote to memory of 2956	456	WScript.exe	101
PID 456 wrote to memory of 2956	456	WScript.exe	101
PID 2956 wrote to memory of 4352	2956	cmd.exe	98
PID 2956 wrote to memory of 4352	2956	cmd.exe	98
PID 4352 wrote to memory of 1852	4352	reviewWinMonitornetwinref.exe	113
PID 4352 wrote to memory of 1852	4352	reviewWinMonitornetwinref.exe	113
PID 4352 wrote to memory of 3412	4352	reviewWinMonitornetwinref.exe	112
PID 4352 wrote to memory of 3412	4352	reviewWinMonitornetwinref.exe	112
PID 4352 wrote to memory of 3332	4352	reviewWinMonitornetwinref.exe	111
PID 4352 wrote to memory of 3332	4352	reviewWinMonitornetwinref.exe	111
PID 4352 wrote to memory of 4652	4352	reviewWinMonitornetwinref.exe	109
PID 4352 wrote to memory of 4652	4352	reviewWinMonitornetwinref.exe	109
PID 4352 wrote to memory of 4888	4352	reviewWinMonitornetwinref.exe	107
PID 4352 wrote to memory of 4888	4352	reviewWinMonitornetwinref.exe	107
PID 4888 wrote to memory of 2948	4888	cmd.exe	105
PID 4888 wrote to memory of 2948	4888	cmd.exe	105
PID 4888 wrote to memory of 4376	4888	cmd.exe	104
PID 4888 wrote to memory of 4376	4888	cmd.exe	104
PID 4888 wrote to memory of 2780	4888	cmd.exe	117
PID 4888 wrote to memory of 2780	4888	cmd.exe	117

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\450db4964978e42ce9403a9dd174586a.exe
"C:\Users\Admin\AppData\Local\Temp\450db4964978e42ce9403a9dd174586a.exe"
1⤵
PID:4332
- C:\Windows\SysWOW64\NOTEPAD.EXE
  "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\ERROR REPORT.txt
  2⤵
  PID:2828
- C:\Users\Admin\AppData\Local\Temp\WindowsProtect.exe
  "C:\Users\Admin\AppData\Local\Temp\WindowsProtect.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:4644
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\reviewWinMonitornet\eBsNFS4M1Cr6.vbe"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:456
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\reviewWinMonitornet\bd5em.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2956

C:\reviewWinMonitornet\reviewWinMonitornetwinref.exe
"C:\reviewWinMonitornet\reviewWinMonitornetwinref.exe"
1⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in System32 directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4352
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\l5GkgtmYxi.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4888
- - C:\Windows\System32\WerEnc\spoolsv.exe
    "C:\Windows\System32\WerEnc\spoolsv.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2780
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "conhost" /sc ONLOGON /tr "'C:\ProgramData\Microsoft OneDrive\setup\conhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4652
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\WerEnc\spoolsv.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3332
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "services" /sc ONLOGON /tr "'C:\odt\services.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3412
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\iasacct\conhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1852

C:\Windows\system32\PING.EXE
ping -n 5 localhost
1⤵
- Runs ping.exe
PID:4376

C:\Windows\system32\chcp.com
chcp 65001
1⤵
PID:2948

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ERROR REPORT.txt

Filesize
617B

MD5
292806f9ebd655b601d4fe9e9c482d9f

SHA1
be73ffc844d1071a6a98131861c39e29ca5b8d8c

SHA256
c7c19f3cb0e3c8f820c36fa809d20ed776d2312314b81e1ccb6098fdc541c55e

SHA512
a3468990b4867f3722de1040cdd720cc72cfa590b3643db1aa6a8d5293e4a09f73c5f9f7f5914cd2bf5d0a1cdc6283e9396bfd90574a41003d8397fa67bcc6dd

Download Submit
C:\reviewWinMonitornet\bd5em.bat

Filesize
54B

MD5
9df63e9c561f81f79b3497b58c3828ed

SHA1
6ab555ba50d36da8c90f1f3f0bca8cc8c6dadc8f

SHA256
1d4287b2d55274c4bd758558adf7441b0a97036db08073d00f153488c2f4af24

SHA512
43f9c25bb45f84629cfec6778a083c0166cd63564f5d89493ee80facbf5f0a04e776691332e75c21a78ddf4276d483966f7ff678d0240a1eac1f9870bdf9ae02

Download Submit
memory/2780-49-0x00007FFF91D20000-0x00007FFF927E1000-memory.dmp

Filesize
10.8MB

Download
memory/2780-52-0x00007FFF91D20000-0x00007FFF927E1000-memory.dmp

Filesize
10.8MB

Download
memory/2780-50-0x000000001BAB0000-0x000000001BAC0000-memory.dmp

Filesize
64KB

Download
memory/4332-2-0x0000000074D90000-0x0000000075341000-memory.dmp

Filesize
5.7MB

Download
memory/4332-0-0x0000000074D90000-0x0000000075341000-memory.dmp

Filesize
5.7MB

Download
memory/4332-14-0x0000000074D90000-0x0000000075341000-memory.dmp

Filesize
5.7MB

Download
memory/4332-1-0x00000000011A0000-0x00000000011B0000-memory.dmp

Filesize
64KB

Download
memory/4352-28-0x0000000000B80000-0x0000000000C2A000-memory.dmp

Filesize
680KB

Download
memory/4352-45-0x00007FFF91D20000-0x00007FFF927E1000-memory.dmp

Filesize
10.8MB

Download
memory/4352-30-0x0000000001520000-0x0000000001530000-memory.dmp

Filesize
64KB

Download
memory/4352-29-0x00007FFF91D20000-0x00007FFF927E1000-memory.dmp

Filesize
10.8MB

Download