dcrat | d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098

Analysis

max time kernel
147s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20231127-en
resource tags

arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
submitted
02/12/2023, 09:26

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Size 828KB
Sample231202-lefhmsbc81
SHA256 d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098
MD5 368c7fe07e9af04159f6d26f9e60c8a2
SHA1 de2538ac77088bb2ad1ad1e2e2bcd4fd8e17c278
SHA512 8793046a620117b6045b63985e86cfe462c07d7888da93f2a861192217c9a54343439aa3a521f6a28d26fa6d8057d7d96040d6501425cc9f097c12ce72eb84a2
SSDEEP 12288:asAvZ29nZTZLNzM0y0UxNAwRIXrbq+mdx+v+bch6cHyU:a1cnZTZLen0UxH4SQmE6OyU
MD5 SHA1 SHA512 SSDEEP

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

Modifies WinLogon for persistence 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\odt\\System.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\odt\\System.exe\", \"C:\\Recovery\\WindowsRE\\SearchApp.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\odt\\System.exe\", \"C:\\Recovery\\WindowsRE\\SearchApp.exe\", \"C:\\Program Files\\Windows Mail\\sppsvc.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\odt\\System.exe\", \"C:\\Recovery\\WindowsRE\\SearchApp.exe\", \"C:\\Program Files\\Windows Mail\\sppsvc.exe\", \"C:\\odt\\taskhostw.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe

Process spawned unexpected child process 12 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	3652	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	728	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4104	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2440	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4456	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3692	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4780	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4384	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1304	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3016	4168	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4400	4168	schtasks.exe	88

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1316-0-0x0000000000340000-0x0000000000416000-memory.dmp	dcrat
behavioral2/files/0x0007000000023203-18.dat	dcrat
behavioral2/files/0x0007000000023203-19.dat	dcrat
behavioral2/files/0x0007000000023203-20.dat	dcrat

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-1-5-21-1067295379-1486014338-1703171060-1000\Control Panel\International\Geo\Nation	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe

Executes dropped EXE 1 IoCs

pid	Process
4544	sppsvc.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1067295379-1486014338-1703171060-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SearchApp = "\"C:\\Recovery\\WindowsRE\\SearchApp.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SearchApp = "\"C:\\Recovery\\WindowsRE\\SearchApp.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1067295379-1486014338-1703171060-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Program Files\\Windows Mail\\sppsvc.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Program Files\\Windows Mail\\sppsvc.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1067295379-1486014338-1703171060-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhostw = "\"C:\\odt\\taskhostw.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhostw = "\"C:\\odt\\taskhostw.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1067295379-1486014338-1703171060-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\odt\\System.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\odt\\System.exe\""	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Windows Mail\sppsvc.exe	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
File created	C:\Program Files\Windows Mail\0a1fd5f707cd16	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.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 12 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
3652	schtasks.exe
4104	schtasks.exe
2440	schtasks.exe
4456	schtasks.exe
3016	schtasks.exe
1304	schtasks.exe
4400	schtasks.exe
728	schtasks.exe
3692	schtasks.exe
4780	schtasks.exe
2712	schtasks.exe
4384	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1067295379-1486014338-1703171060-1000_Classes\Local Settings	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe
4544	sppsvc.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4544	sppsvc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
Token: SeDebugPrivilege	4544	sppsvc.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1316 wrote to memory of 3848	1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe	101
PID 1316 wrote to memory of 3848	1316	d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe	101
PID 3848 wrote to memory of 4868	3848	cmd.exe	103
PID 3848 wrote to memory of 4868	3848	cmd.exe	103
PID 3848 wrote to memory of 4544	3848	cmd.exe	106
PID 3848 wrote to memory of 4544	3848	cmd.exe	106

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\d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe
"C:\Users\Admin\AppData\Local\Temp\d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1316
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\dtQqd0OfZY.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3848
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4868
- - C:\Program Files\Windows Mail\sppsvc.exe
    "C:\Program Files\Windows Mail\sppsvc.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:4544

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\odt\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\odt\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:728

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\odt\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2440

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
- Creates scheduled task(s)
PID:4456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3692

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\Program Files\Windows Mail\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Windows Mail\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Mail\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4384

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\odt\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\odt\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 5 /tr "'C:\odt\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4400

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

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

Loading Replay Monitor...

Downloads

sppsvc.exe

Path C:\Program Files\Windows Mail\sppsvc.exe
Size 828KB
SHA256 d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098
MD5 368c7fe07e9af04159f6d26f9e60c8a2
SHA1 de2538ac77088bb2ad1ad1e2e2bcd4fd8e17c278
SHA512 8793046a620117b6045b63985e86cfe462c07d7888da93f2a861192217c9a54343439aa3a521f6a28d26fa6d8057d7d96040d6501425cc9f097c12ce72eb84a2
SSDEEP 12288:asAvZ29nZTZLNzM0y0UxNAwRIXrbq+mdx+v+bch6cHyU:a1cnZTZLen0UxH4SQmE6OyU
MD5 SHA1 SHA512 SSDEEP

Submit Download

sppsvc.exe

Path C:\Program Files\Windows Mail\sppsvc.exe
Size 828KB
SHA256 d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098
MD5 368c7fe07e9af04159f6d26f9e60c8a2
SHA1 de2538ac77088bb2ad1ad1e2e2bcd4fd8e17c278
SHA512 8793046a620117b6045b63985e86cfe462c07d7888da93f2a861192217c9a54343439aa3a521f6a28d26fa6d8057d7d96040d6501425cc9f097c12ce72eb84a2
SSDEEP 12288:asAvZ29nZTZLNzM0y0UxNAwRIXrbq+mdx+v+bch6cHyU:a1cnZTZLen0UxH4SQmE6OyU
MD5 SHA1 SHA512 SSDEEP

Submit Download

sppsvc.exe

Path C:\Program Files\Windows Mail\sppsvc.exe
Size 828KB
SHA256 d26fbb4ec536593894550c4738e22bf8909d15f8bc8bc961e2e0d02d0a093098
MD5 368c7fe07e9af04159f6d26f9e60c8a2
SHA1 de2538ac77088bb2ad1ad1e2e2bcd4fd8e17c278
SHA512 8793046a620117b6045b63985e86cfe462c07d7888da93f2a861192217c9a54343439aa3a521f6a28d26fa6d8057d7d96040d6501425cc9f097c12ce72eb84a2
SSDEEP 12288:asAvZ29nZTZLNzM0y0UxNAwRIXrbq+mdx+v+bch6cHyU:a1cnZTZLen0UxH4SQmE6OyU
MD5 SHA1 SHA512 SSDEEP

Submit Download

dtQqd0OfZY.bat

Path C:\Users\Admin\AppData\Local\Temp\dtQqd0OfZY.bat
Size 205B
SHA256 1c7b91fa8dd84c2ac6fbeb3d5f11e6108e9b05ca8b059c700e24bc01f5565557
MD5 71f39a368d7089be821ae5ca02b159fc
SHA1 9bdbb914ce5b16a6ceac8607a91278f90f202123
SHA512 4595fbb4bdf39eeda6f47514974d156a14beab33819d62e695c5c6e61748f02047e0631fe370451c6d7ea570374c9b3ddb11a286ed8fd9e1fadf11fcf3dbafb4
MD5 SHA1 SHA512

Submit Download

memory/1316-0-0x0000000000340000-0x0000000000416000-memory.dmp

Download

memory/1316-1-0x00007FFFBFB70000-0x00007FFFC0631000-memory.dmp

Download

memory/1316-2-0x000000001AF80000-0x000000001AF90000-memory.dmp

Download

memory/1316-17-0x00007FFFBFB70000-0x00007FFFC0631000-memory.dmp

Download

memory/4544-21-0x00007FFFBF840000-0x00007FFFC0301000-memory.dmp

Download

memory/4544-22-0x000000001B4D0000-0x000000001B4E0000-memory.dmp

Download

memory/4544-23-0x00007FFFBF840000-0x00007FFFC0301000-memory.dmp

Download

memory/4544-24-0x000000001B4D0000-0x000000001B4E0000-memory.dmp

Download