dcrat | a1ddae9574bbeadd40b789fc8c7719b47c0d4bd8ed93abbd1d07f7e866ac40a6

Analysis

max time kernel
102s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:14

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General

Target

99bf8880724cd8aa8da8dcf4b716be4b.exe
Size

984KB
MD5

99bf8880724cd8aa8da8dcf4b716be4b
SHA1

e680337915c7a5a85de7f89ec9bf5455cf3bc75f
SHA256

da677897f339e128512b323a559ed62e782b2115237bb1a0a8bd1092c2d5723f
SHA512

05f82864179d4cbe15cf474001c1696b3a7a9d705864a14d41254a04bc9c56c87804a508d3f139f3db8297b0c50f9bbe2358552a2a0e5218f41bb245abb87c9b
SSDEEP

12288:zzZvuvewk/0pPPXA5q/TQ9+n95vV25gnwHexSDwbwvDxlpaS98IUNldnd65EgF1s:zzZvuGD2PvA5YxwmbZB6Uv

Score

10^/10

dcrat infostealer persistence 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

Process spawned unexpected child process 4 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	2696	3440	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2060	3440	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5192	3440	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5980	3440	schtasks.exe	86

Checks computer location settings 2 TTPs 1 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-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	99bf8880724cd8aa8da8dcf4b716be4b.exe

Executes dropped EXE 1 IoCs

pid	Process
5488	dllhost.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhostw = "\"C:\\aff403968f1bfcc42131676322798b50\\taskhostw.exe\""	99bf8880724cd8aa8da8dcf4b716be4b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\RdpSaUacHelper\\RuntimeBroker.exe\""	99bf8880724cd8aa8da8dcf4b716be4b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Windows\\System32\\provisioningcsp\\SppExtComObj.exe\""	99bf8880724cd8aa8da8dcf4b716be4b.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\pautoenr\\dllhost.exe\""	99bf8880724cd8aa8da8dcf4b716be4b.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\provisioningcsp\RCX637F.tmp	99bf8880724cd8aa8da8dcf4b716be4b.exe
File opened for modification	C:\Windows\System32\provisioningcsp\SppExtComObj.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File opened for modification	C:\Windows\System32\pautoenr\RCX6583.tmp	99bf8880724cd8aa8da8dcf4b716be4b.exe
File opened for modification	C:\Windows\System32\RdpSaUacHelper\RuntimeBroker.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\provisioningcsp\e1ef82546f0b02	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\pautoenr\dllhost.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File opened for modification	C:\Windows\System32\pautoenr\dllhost.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\RdpSaUacHelper\RuntimeBroker.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\RdpSaUacHelper\9e8d7a4ca61bd9	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\provisioningcsp\SppExtComObj.exe	99bf8880724cd8aa8da8dcf4b716be4b.exe
File created	C:\Windows\System32\pautoenr\5940a34987c991	99bf8880724cd8aa8da8dcf4b716be4b.exe
File opened for modification	C:\Windows\System32\RdpSaUacHelper\RCX617A.tmp	99bf8880724cd8aa8da8dcf4b716be4b.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2696	schtasks.exe
2060	schtasks.exe
5192	schtasks.exe
5980	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3016	99bf8880724cd8aa8da8dcf4b716be4b.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3016	99bf8880724cd8aa8da8dcf4b716be4b.exe
Token: SeDebugPrivilege	5488	dllhost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3016 wrote to memory of 5488	3016	99bf8880724cd8aa8da8dcf4b716be4b.exe	94
PID 3016 wrote to memory of 5488	3016	99bf8880724cd8aa8da8dcf4b716be4b.exe	94

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\99bf8880724cd8aa8da8dcf4b716be4b.exe
"C:\Users\Admin\AppData\Local\Temp\99bf8880724cd8aa8da8dcf4b716be4b.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3016
- C:\Windows\System32\pautoenr\dllhost.exe
  "C:\Windows\System32\pautoenr\dllhost.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:5488

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\RdpSaUacHelper\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2696

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\provisioningcsp\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\pautoenr\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5192

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\aff403968f1bfcc42131676322798b50\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5980

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\System32\RdpSaUacHelper\RuntimeBroker.exe

Filesize
984KB

MD5
99bf8880724cd8aa8da8dcf4b716be4b

SHA1
e680337915c7a5a85de7f89ec9bf5455cf3bc75f

SHA256
da677897f339e128512b323a559ed62e782b2115237bb1a0a8bd1092c2d5723f

SHA512
05f82864179d4cbe15cf474001c1696b3a7a9d705864a14d41254a04bc9c56c87804a508d3f139f3db8297b0c50f9bbe2358552a2a0e5218f41bb245abb87c9b

Download Submit
memory/3016-9-0x000000001B510000-0x000000001B51C000-memory.dmp

Filesize
48KB

Download
memory/3016-12-0x000000001B5A0000-0x000000001B5AC000-memory.dmp

Filesize
48KB

Download
memory/3016-3-0x000000001B3B0000-0x000000001B3CC000-memory.dmp

Filesize
112KB

Download
memory/3016-4-0x000000001B550000-0x000000001B5A0000-memory.dmp

Filesize
320KB

Download
memory/3016-5-0x0000000002980000-0x0000000002990000-memory.dmp

Filesize
64KB

Download
memory/3016-8-0x000000001B500000-0x000000001B510000-memory.dmp

Filesize
64KB

Download
memory/3016-2-0x00007FFA52D80000-0x00007FFA53841000-memory.dmp

Filesize
10.8MB

Download
memory/3016-6-0x000000001B3D0000-0x000000001B3E0000-memory.dmp

Filesize
64KB

Download
memory/3016-7-0x000000001B3E0000-0x000000001B3E8000-memory.dmp

Filesize
32KB

Download
memory/3016-10-0x000000001B520000-0x000000001B532000-memory.dmp

Filesize
72KB

Download
memory/3016-0-0x00007FFA52D83000-0x00007FFA52D85000-memory.dmp

Filesize
8KB

Download
memory/3016-11-0x000000001C240000-0x000000001C768000-memory.dmp

Filesize
5.2MB

Download
memory/3016-1-0x00000000006C0000-0x00000000007BC000-memory.dmp

Filesize
1008KB

Download
memory/3016-87-0x00007FFA52D80000-0x00007FFA53841000-memory.dmp

Filesize
10.8MB

Download
memory/5488-88-0x000000001B6A0000-0x000000001B6B2000-memory.dmp

Filesize
72KB

Download