dcrat | f6a307d243c407c27489de37adac83e9205be531cbb4e2cb71545627faf813fd

Resubmissions

11-01-2021 13:09

210111-dlhjyngw66 8

11-01-2021 07:36

210111-xfhgmxjy6n 10

Analysis

max time kernel
143s
max time network
152s
platform
windows10_x64
resource
win10v20201028
submitted
11-01-2021 07:36

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

4ced2056e4efe1c93b9f4adaaeaba20c.exe
Size

607KB
MD5

4ced2056e4efe1c93b9f4adaaeaba20c
SHA1

b975777c42d7d8fb04c34a2efc64dc5e4c574712
SHA256

f6a307d243c407c27489de37adac83e9205be531cbb4e2cb71545627faf813fd
SHA512

014df0ad54bf23335f964fa4e313a91b60b3ea2c62b73a306e973177830b573666aaebc1932cafa766042f34b8e32adcfabe3027aae2cc09341fd138a8963eaf

Score

10^/10

dcrat evasion infostealer rat spyware stealer

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DC Rat Payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00020000000152e1-15.dat	dcrat
behavioral2/files/0x00020000000152e1-16.dat	dcrat
behavioral2/files/0x000100000001ab78-28.dat	dcrat
behavioral2/files/0x000100000001ab78-29.dat	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 3 IoCs

pid	Process
808	HoykwG9pmLZ7sZbSP8eb.exe
4364	winrar-x84.exe
2476	fontdrvhost.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
19	ipinfo.io
20	ipinfo.io
21	ipinfo.io

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System\fontdrvhost.exe	winrar-x84.exe
File created	C:\Windows\System\5b884080fd4f94e2695da25c503f9e33b9605b83	winrar-x84.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 7 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
996	schtasks.exe
1152	schtasks.exe
1404	schtasks.exe
1488	schtasks.exe
1688	schtasks.exe
1964	schtasks.exe
2224	schtasks.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	4ced2056e4efe1c93b9f4adaaeaba20c.exe
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	HoykwG9pmLZ7sZbSP8eb.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
4508	reg.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4364	winrar-x84.exe
2476	fontdrvhost.exe
2476	fontdrvhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4364	winrar-x84.exe
Token: SeDebugPrivilege	2476	fontdrvhost.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	74
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	74
PID 4648 wrote to memory of 1640	4648	4ced2056e4efe1c93b9f4adaaeaba20c.exe	74
PID 1640 wrote to memory of 4208	1640	WScript.exe	76
PID 1640 wrote to memory of 4208	1640	WScript.exe	76
PID 1640 wrote to memory of 4208	1640	WScript.exe	76
PID 4208 wrote to memory of 808	4208	cmd.exe	78
PID 4208 wrote to memory of 808	4208	cmd.exe	78
PID 4208 wrote to memory of 808	4208	cmd.exe	78
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	79
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	79
PID 808 wrote to memory of 3088	808	HoykwG9pmLZ7sZbSP8eb.exe	79
PID 3088 wrote to memory of 1868	3088	WScript.exe	82
PID 3088 wrote to memory of 1868	3088	WScript.exe	82
PID 3088 wrote to memory of 1868	3088	WScript.exe	82
PID 1868 wrote to memory of 4364	1868	cmd.exe	84
PID 1868 wrote to memory of 4364	1868	cmd.exe	84
PID 4364 wrote to memory of 996	4364	winrar-x84.exe	87
PID 4364 wrote to memory of 996	4364	winrar-x84.exe	87
PID 4364 wrote to memory of 1152	4364	winrar-x84.exe	89
PID 4364 wrote to memory of 1152	4364	winrar-x84.exe	89
PID 4364 wrote to memory of 1404	4364	winrar-x84.exe	91
PID 4364 wrote to memory of 1404	4364	winrar-x84.exe	91
PID 4364 wrote to memory of 1488	4364	winrar-x84.exe	93
PID 4364 wrote to memory of 1488	4364	winrar-x84.exe	93
PID 4364 wrote to memory of 1688	4364	winrar-x84.exe	95
PID 4364 wrote to memory of 1688	4364	winrar-x84.exe	95
PID 4364 wrote to memory of 1964	4364	winrar-x84.exe	97
PID 4364 wrote to memory of 1964	4364	winrar-x84.exe	97
PID 4364 wrote to memory of 2224	4364	winrar-x84.exe	99
PID 4364 wrote to memory of 2224	4364	winrar-x84.exe	99
PID 4364 wrote to memory of 2476	4364	winrar-x84.exe	101
PID 4364 wrote to memory of 2476	4364	winrar-x84.exe	101
PID 1868 wrote to memory of 4508	1868	cmd.exe	102
PID 1868 wrote to memory of 4508	1868	cmd.exe	102
PID 1868 wrote to memory of 4508	1868	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe
"C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4648
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\wSmIzsMZSTGIPjXygtTeiEZYkIjJjD.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1640
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WinRAR\wAcLjfo4uMcnTa1rAjnz0eLcoo04D9.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4208
  - - C:\Users\Admin\AppData\Roaming\WinRAR\HoykwG9pmLZ7sZbSP8eb.exe
      HoykwG9pmLZ7sZbSP8eb.exe -p2e840a597483ac4423c7c5ec1a09b39042cbf75d
      4⤵
      Executes dropped EXE
      Modifies registry class
      Suspicious use of WriteProcessMemory
      PID:808
    - - C:\Windows\SysWOW64\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\tPKG2uMJtmCS4Bv6TMepBvdoqxAPGa.vbe"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3088
      - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\WinRAR\mQE440b4P9lIBPO3Qboqf8inqaQoJr.bat" "
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:1868
        
        C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe
        
        "C:\Users\Admin\AppData\Roaming\WinRAR\winrar-x84.exe"
        7⤵
        Executes dropped EXE
        Drops file in Windows directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4364
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "Idle" /sc ONLOGON /tr "'C:\ProgramData\Microsoft\Speech_OneCore\Idle.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:996
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "explorer" /sc ONLOGON /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1152
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\odt\dllhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1404
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dwm" /sc ONLOGON /tr "'C:\Users\Admin\Desktop\dwm.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1488
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1688
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\Default\Desktop\sppsvc.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1964
        
        C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System\fontdrvhost.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:2224
        
        C:\Windows\System\fontdrvhost.exe
        
        "C:\Windows\System\fontdrvhost.exe"
        8⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2476
        
        C:\Windows\SysWOW64\reg.exe
        
        reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
        7⤵
        Modifies registry key
        
        PID:4508

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/2476-34-0x000001EE36DE0000-0x000001EE36DE1000-memory.dmp

Filesize
4KB

Download
memory/2476-30-0x00007FFBE0110000-0x00007FFBE0AFC000-memory.dmp

Filesize
9.9MB

Download
memory/4364-18-0x00000266F7760000-0x00000266F7761000-memory.dmp

Filesize
4KB

Download
memory/4364-17-0x00007FFBE0110000-0x00007FFBE0AFC000-memory.dmp

Filesize
9.9MB

Download