dcrat | 321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\", \"C:\\Windows\\System32\\powrprof\\spoolsv.exe\", \"C:\\Documents and Settings\\csrss.exe\", \"C:\\Windows\\System32\\accessibilitycpl\\smss.exe\", \"C:\\Windows\\System32\\QUTIL\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\", \"C:\\Windows\\System32\\powrprof\\spoolsv.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\", \"C:\\Windows\\System32\\powrprof\\spoolsv.exe\", \"C:\\Documents and Settings\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\", \"C:\\Windows\\System32\\powrprof\\spoolsv.exe\", \"C:\\Documents and Settings\\csrss.exe\", \"C:\\Windows\\System32\\accessibilitycpl\\smss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe

Process spawned unexpected child process 5 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	2756	2844	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2908	2844	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2808	2844	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2776	2844	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2616	2844	schtasks.exe	30

UAC bypass 3 TTPs 6 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	spoolsv.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1680-1-0x0000000000880000-0x0000000000974000-memory.dmp	dcrat
behavioral1/files/0x0005000000019441-20.dat	dcrat
behavioral1/files/0x000d0000000173fb-59.dat	dcrat
behavioral1/memory/1332-94-0x0000000000DF0000-0x0000000000EE4000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1332	spoolsv.exe

Adds Run key to start application 2 TTPs 10 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\powrprof\\spoolsv.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\powrprof\\spoolsv.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Documents and Settings\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\accessibilitycpl\\smss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\QUTIL\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\sysprepMCE\\lsm.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\QUTIL\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Documents and Settings\\csrss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\accessibilitycpl\\smss.exe\""	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe

Drops file in System32 directory 20 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\sysprepMCE\lsm.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\sysprepMCE\101b941d020240259ca4912829b53995ad543df6	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\accessibilitycpl\69ddcba757bf72f7d36c464c71f42baab150b2b9	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\QUTIL\csrss.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\QUTIL\886983d96e3d3e31032c679b2d4ea91b6c05afef	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\QUTIL\RCXA1D6.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\sysprepMCE\RCX98E8.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\powrprof\RCX9AED.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\accessibilitycpl\RCX9F63.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\QUTIL\csrss.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\sysprepMCE\lsm.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\accessibilitycpl\smss.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\sysprepMCE\RCX98E7.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\accessibilitycpl\RCX9F64.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\powrprof\spoolsv.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File created	C:\Windows\System32\powrprof\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\powrprof\RCX9AEC.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\powrprof\spoolsv.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\accessibilitycpl\smss.exe	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
File opened for modification	C:\Windows\System32\QUTIL\RCXA1D5.tmp	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.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 5 IoCs

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

persistence execution

Scheduled Task

pid	Process
2616	schtasks.exe
2756	schtasks.exe
2908	schtasks.exe
2808	schtasks.exe
2776	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1680	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1680	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Token: SeDebugPrivilege	1332	spoolsv.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1680 wrote to memory of 2368	1680	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe	36
PID 1680 wrote to memory of 2368	1680	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe	36
PID 1680 wrote to memory of 2368	1680	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe	36
PID 2368 wrote to memory of 1716	2368	cmd.exe	38
PID 2368 wrote to memory of 1716	2368	cmd.exe	38
PID 2368 wrote to memory of 1716	2368	cmd.exe	38
PID 2368 wrote to memory of 1332	2368	cmd.exe	39
PID 2368 wrote to memory of 1332	2368	cmd.exe	39
PID 2368 wrote to memory of 1332	2368	cmd.exe	39

System policy modification 1 TTPs 6 IoCs

defense_evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	spoolsv.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	spoolsv.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\321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe
"C:\Users\Admin\AppData\Local\Temp\321107b1a9dc78b8423ea89958b0d7fb31866f74b3ff1c42c0b4884246a6dfb3.exe"
1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1680
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\6DzDemiKWR.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2368
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1716
- - C:\Windows\System32\powrprof\spoolsv.exe
    "C:\Windows\System32\powrprof\spoolsv.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:1332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\sysprepMCE\lsm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\powrprof\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Documents and Settings\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\accessibilitycpl\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2776

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\QUTIL\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2616

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry