dcrat | a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262

General

Target

a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe
Size

2.3MB
MD5

76842313355a159ae3f15beb42b7523c
SHA1

f07888bc191e4d7f42908b66a1ae9600a5d82d4e
SHA256

a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262
SHA512

9f66f217faacf5ed8684b778b305cdfd3c66f99e11fc0adb330221db2f75c5d2798a701b8a55aa7da94fead1fd94052242e094313c641d5b21c3e314667ce330
SSDEEP

24576:tg1trubkn3XjeUtXpi6lCIGlq765OkIXexdd2LCPm016qCir11X/6S/wn9UySfzV:idXjptfoI3eJIzQ6qTr7X3MFSu+L39l

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

Modifies WinLogon for persistence 2 TTPs 1 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:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe

Process spawned unexpected child process 3 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	3004	2916	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2636	2916	schtasks.exe	29
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2148	2916	schtasks.exe	29

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2380-1-0x0000000000300000-0x0000000000550000-memory.dmp	dcrat
behavioral1/files/0x000a00000001225c-16.dat	dcrat
behavioral1/memory/2876-18-0x0000000000250000-0x00000000004A0000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2876	lsass.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.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 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3004	schtasks.exe
2636	schtasks.exe
2148	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2380	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe
2876	lsass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2380	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe
Token: SeDebugPrivilege	2876	lsass.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 2876	2380	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe	33
PID 2380 wrote to memory of 2876	2380	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe	33
PID 2380 wrote to memory of 2876	2380	a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe	33

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\a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe
"C:\Users\Admin\AppData\Local\Temp\a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2380
- C:\Users\Admin\AppData\Local\Microsoft\lsass.exe
  "C:\Users\Admin\AppData\Local\Microsoft\lsass.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3004

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2148

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\lsass.exe

Filesize
2.3MB

MD5
76842313355a159ae3f15beb42b7523c

SHA1
f07888bc191e4d7f42908b66a1ae9600a5d82d4e

SHA256
a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262

SHA512
9f66f217faacf5ed8684b778b305cdfd3c66f99e11fc0adb330221db2f75c5d2798a701b8a55aa7da94fead1fd94052242e094313c641d5b21c3e314667ce330

Download Submit
memory/2380-0-0x000007FEF5E03000-0x000007FEF5E04000-memory.dmp

Filesize
4KB

Download
memory/2380-1-0x0000000000300000-0x0000000000550000-memory.dmp

Filesize
2.3MB

Download
memory/2380-2-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2380-3-0x00000000002D0000-0x00000000002EC000-memory.dmp

Filesize
112KB

Download
memory/2380-4-0x0000000000670000-0x0000000000686000-memory.dmp

Filesize
88KB

Download
memory/2380-5-0x000000001A850000-0x000000001A8A6000-memory.dmp

Filesize
344KB

Download
memory/2380-6-0x00000000001C0000-0x00000000001D2000-memory.dmp

Filesize
72KB

Download
memory/2380-7-0x00000000002F0000-0x00000000002FE000-memory.dmp

Filesize
56KB

Download
memory/2380-8-0x0000000000650000-0x0000000000658000-memory.dmp

Filesize
32KB

Download
memory/2380-17-0x000007FEF5E00000-0x000007FEF67EC000-memory.dmp

Filesize
9.9MB

Download
memory/2876-18-0x0000000000250000-0x00000000004A0000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads