dcrat | 8fe2dc79406633301e735531a3ba11b1136838ccfb21ab149b06115f36ee3243

Analysis

max time kernel
92s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-01-2025 13:11

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General

Target

18b132b3bb8258358bbef60b2807923c.exe
Size

828KB
MD5

18b132b3bb8258358bbef60b2807923c
SHA1

1a6dea54b8dbaafc894c426425f3f207fa7df156
SHA256

8fe2dc79406633301e735531a3ba11b1136838ccfb21ab149b06115f36ee3243
SHA512

fc909490a131af1d724253bacbb44d516460190725e5f2d742ce0c53568cb3499ef5fb541b6ecc99ebe5a3a04f6636d4423305579fee17e2f108e884e6335964
SSDEEP

12288:3PrWRdiFHcEtCJpDod8Guj/ban6rBPgNrCDbAz8zckbh:3PrfF8EteW8GujM6YIz3V

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 family
dcrat

Process spawned unexpected child process 27 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	1408	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2972	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2396	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3064	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	624	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1332	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3044	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1560	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1448	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1872	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4548	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	448	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1484	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4112	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1400	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4860	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2224	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	32	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2936	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3248	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4508	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4520	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4516	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4812	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1204	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1880	2156	schtasks.exe	83
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2276	2156	schtasks.exe	83

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4412-1-0x0000000000A30000-0x0000000000B06000-memory.dmp	dcrat
behavioral2/files/0x0007000000023cb0-12.dat	dcrat

Checks computer location settings 2 TTPs 2 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	18b132b3bb8258358bbef60b2807923c.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	18b132b3bb8258358bbef60b2807923c.exe

Executes dropped EXE 1 IoCs

pid	Process
3724	winlogon.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft.NET\RedistList\cc11b995f2a76d	18b132b3bb8258358bbef60b2807923c.exe
File created	C:\Program Files\Microsoft Office\PackageManifests\smss.exe	18b132b3bb8258358bbef60b2807923c.exe
File created	C:\Program Files\Microsoft Office\PackageManifests\69ddcba757bf72	18b132b3bb8258358bbef60b2807923c.exe
File created	C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe	18b132b3bb8258358bbef60b2807923c.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Offline Web Pages\sysmon.exe	18b132b3bb8258358bbef60b2807923c.exe
File created	C:\Windows\Offline Web Pages\121e5b5079f7c0	18b132b3bb8258358bbef60b2807923c.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	18b132b3bb8258358bbef60b2807923c.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 27 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1560	schtasks.exe
2224	schtasks.exe
1880	schtasks.exe
3248	schtasks.exe
1332	schtasks.exe
3044	schtasks.exe
32	schtasks.exe
4812	schtasks.exe
1400	schtasks.exe
2972	schtasks.exe
1204	schtasks.exe
2276	schtasks.exe
1408	schtasks.exe
4548	schtasks.exe
448	schtasks.exe
4508	schtasks.exe
624	schtasks.exe
1872	schtasks.exe
1484	schtasks.exe
1448	schtasks.exe
2936	schtasks.exe
4112	schtasks.exe
4860	schtasks.exe
4520	schtasks.exe
4516	schtasks.exe
2396	schtasks.exe
3064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
4412	18b132b3bb8258358bbef60b2807923c.exe
1360	18b132b3bb8258358bbef60b2807923c.exe
1360	18b132b3bb8258358bbef60b2807923c.exe
1360	18b132b3bb8258358bbef60b2807923c.exe
1360	18b132b3bb8258358bbef60b2807923c.exe
1360	18b132b3bb8258358bbef60b2807923c.exe
3724	winlogon.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4412	18b132b3bb8258358bbef60b2807923c.exe
Token: SeDebugPrivilege	1360	18b132b3bb8258358bbef60b2807923c.exe
Token: SeDebugPrivilege	3724	winlogon.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4412 wrote to memory of 1360	4412	18b132b3bb8258358bbef60b2807923c.exe	93
PID 4412 wrote to memory of 1360	4412	18b132b3bb8258358bbef60b2807923c.exe	93
PID 1360 wrote to memory of 4932	1360	18b132b3bb8258358bbef60b2807923c.exe	112
PID 1360 wrote to memory of 4932	1360	18b132b3bb8258358bbef60b2807923c.exe	112
PID 4932 wrote to memory of 2312	4932	cmd.exe	114
PID 4932 wrote to memory of 2312	4932	cmd.exe	114
PID 4932 wrote to memory of 3724	4932	cmd.exe	115
PID 4932 wrote to memory of 3724	4932	cmd.exe	115

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\18b132b3bb8258358bbef60b2807923c.exe
"C:\Users\Admin\AppData\Local\Temp\18b132b3bb8258358bbef60b2807923c.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4412
- C:\Users\Admin\AppData\Local\Temp\18b132b3bb8258358bbef60b2807923c.exe
  "C:\Users\Admin\AppData\Local\Temp\18b132b3bb8258358bbef60b2807923c.exe"
  2⤵
  - Checks computer location settings
  - Drops file in Program Files directory
  - Drops file in Windows directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1360
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Yw9TnRPWzu.bat"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4932
  - - C:\Windows\system32\w32tm.exe
      w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
      4⤵
      PID:2312
  - - C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe
      "C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1408

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2972

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3064

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 14 /tr "'C:\Users\Public\Videos\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Public\Videos\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Users\Public\Videos\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Program Files\Microsoft Office\PackageManifests\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1484

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office\PackageManifests\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office\PackageManifests\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 12 /tr "'C:\Windows\Offline Web Pages\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2224

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 6 /tr "'C:\Windows\Offline Web Pages\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:32

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 12 /tr "'C:\Users\Default\Templates\unsecapp.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Users\Default\Templates\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4516

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 13 /tr "'C:\Users\Default\Templates\unsecapp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2276

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

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

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:\Recovery\WindowsRE\27d1bcfc3c54e0

Filesize
973B

MD5
5b4b31925e7e9e58333c13e2dbef6088

SHA1
06ae4b75c7145f24bad54722fb3e1cea0b099bbc

SHA256
477face207b303bd4d3f3f1e9285a3187a19d539cc6eddbc9c109080abb1698e

SHA512
7552c21fff8d81f845823ebaeb8753571d0365a415ad1891f4a974163bfb180bf0c6cfb1709e933bd94b0de3a58a83d5f409e3a4b7f3458fa3a3e2446d2d3ab3

Download Submit
C:\Recovery\WindowsRE\System.exe

Filesize
828KB

MD5
18b132b3bb8258358bbef60b2807923c

SHA1
1a6dea54b8dbaafc894c426425f3f207fa7df156

SHA256
8fe2dc79406633301e735531a3ba11b1136838ccfb21ab149b06115f36ee3243

SHA512
fc909490a131af1d724253bacbb44d516460190725e5f2d742ce0c53568cb3499ef5fb541b6ecc99ebe5a3a04f6636d4423305579fee17e2f108e884e6335964

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\18b132b3bb8258358bbef60b2807923c.exe.log

Filesize
1KB

MD5
7f3c0ae41f0d9ae10a8985a2c327b8fb

SHA1
d58622bf6b5071beacf3b35bb505bde2000983e3

SHA256
519fceae4d0dd4d09edd1b81bcdfa8aeab4b59eee77a4cd4b6295ce8e591a900

SHA512
8a8fd17eef071f86e672cba0d8fc2cfed6118aff816100b9d7c06eb96443c04c04bc5692259c8d7ecb1563e877921939c61726605af4f969e3f586f0913ed125

Download Submit
C:\Users\Admin\AppData\Local\Temp\Yw9TnRPWzu.bat

Filesize
225B

MD5
7325f8b096866578e1607a2ae2f32bf0

SHA1
ff3a39c5156c3d35bc09b9bb3f515dc256f0689f

SHA256
57e45c0912040b76478206272edc9b65d5ef83204a363d7277d93ac2f6c41605

SHA512
7f33851a9f777514b7325f7b1d1da50a5a7283a7887bded1accec3ac8a4086c880b49df4306acb8ebe9fd9af81d5337da178e90174b69f01814504d7f135d234

Download Submit
memory/4412-0-0x00007FF81EDB3000-0x00007FF81EDB5000-memory.dmp

Filesize
8KB

Download
memory/4412-1-0x0000000000A30000-0x0000000000B06000-memory.dmp

Filesize
856KB

Download
memory/4412-4-0x00007FF81EDB0000-0x00007FF81F871000-memory.dmp

Filesize
10.8MB

Download
memory/4412-11-0x00007FF81EDB0000-0x00007FF81F871000-memory.dmp

Filesize
10.8MB

Download