dcrat | f6a307d243c407c27489de37adac83e9205be531cbb4e2cb71545627faf813fd

Resubmissions

11-01-2021 13:09

210111-dlhjyngw66 8

11-01-2021 07:36

210111-xfhgmxjy6n 10

Analysis

max time kernel
150s
max time network
151s
platform
windows7_x64
resource
win7v20201028
submitted
11-01-2021 07:36

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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 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0003000000013101-16.dat	dcrat
behavioral1/files/0x0003000000013101-18.dat	dcrat
behavioral1/files/0x0003000000013101-19.dat	dcrat
behavioral1/files/0x000300000001311a-30.dat	dcrat
behavioral1/files/0x000300000001311a-31.dat	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 3 IoCs

pid	Process
1252	HoykwG9pmLZ7sZbSP8eb.exe
1528	winrar-x84.exe
268	WmiPrvSE.exe

Loads dropped DLL 2 IoCs

pid	Process
1264	cmd.exe
1064	cmd.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 2 IoCs

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

flow	ioc
6	ipinfo.io
7	ipinfo.io

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\WindowsPowerShell\Modules\csrss.exe	winrar-x84.exe
File created	C:\Program Files (x86)\WindowsPowerShell\Modules\886983d96e3d3e31032c679b2d4ea91b6c05afef	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 6 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1396	schtasks.exe
1864	schtasks.exe
1388	schtasks.exe
1636	schtasks.exe
1856	schtasks.exe
1188	schtasks.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
544	reg.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1528	winrar-x84.exe
268	WmiPrvSE.exe
268	WmiPrvSE.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1528	winrar-x84.exe
Token: SeDebugPrivilege	268	WmiPrvSE.exe

Suspicious use of WriteProcessMemory 49 IoCs

description	pid	Process	procid_target
PID 1184 wrote to memory of 1812	1184	4ced2056e4efe1c93b9f4adaaeaba20c.exe	27
PID 1184 wrote to memory of 1812	1184	4ced2056e4efe1c93b9f4adaaeaba20c.exe	27
PID 1184 wrote to memory of 1812	1184	4ced2056e4efe1c93b9f4adaaeaba20c.exe	27
PID 1184 wrote to memory of 1812	1184	4ced2056e4efe1c93b9f4adaaeaba20c.exe	27
PID 1812 wrote to memory of 1264	1812	WScript.exe	28
PID 1812 wrote to memory of 1264	1812	WScript.exe	28
PID 1812 wrote to memory of 1264	1812	WScript.exe	28
PID 1812 wrote to memory of 1264	1812	WScript.exe	28
PID 1264 wrote to memory of 1252	1264	cmd.exe	30
PID 1264 wrote to memory of 1252	1264	cmd.exe	30
PID 1264 wrote to memory of 1252	1264	cmd.exe	30
PID 1264 wrote to memory of 1252	1264	cmd.exe	30
PID 1252 wrote to memory of 1028	1252	HoykwG9pmLZ7sZbSP8eb.exe	33
PID 1252 wrote to memory of 1028	1252	HoykwG9pmLZ7sZbSP8eb.exe	33
PID 1252 wrote to memory of 1028	1252	HoykwG9pmLZ7sZbSP8eb.exe	33
PID 1252 wrote to memory of 1028	1252	HoykwG9pmLZ7sZbSP8eb.exe	33
PID 1028 wrote to memory of 1064	1028	WScript.exe	34
PID 1028 wrote to memory of 1064	1028	WScript.exe	34
PID 1028 wrote to memory of 1064	1028	WScript.exe	34
PID 1028 wrote to memory of 1064	1028	WScript.exe	34
PID 1064 wrote to memory of 1528	1064	cmd.exe	36
PID 1064 wrote to memory of 1528	1064	cmd.exe	36
PID 1064 wrote to memory of 1528	1064	cmd.exe	36
PID 1064 wrote to memory of 1528	1064	cmd.exe	36
PID 1528 wrote to memory of 1636	1528	winrar-x84.exe	38
PID 1528 wrote to memory of 1636	1528	winrar-x84.exe	38
PID 1528 wrote to memory of 1636	1528	winrar-x84.exe	38
PID 1528 wrote to memory of 1856	1528	winrar-x84.exe	40
PID 1528 wrote to memory of 1856	1528	winrar-x84.exe	40
PID 1528 wrote to memory of 1856	1528	winrar-x84.exe	40
PID 1528 wrote to memory of 1188	1528	winrar-x84.exe	42
PID 1528 wrote to memory of 1188	1528	winrar-x84.exe	42
PID 1528 wrote to memory of 1188	1528	winrar-x84.exe	42
PID 1528 wrote to memory of 1396	1528	winrar-x84.exe	44
PID 1528 wrote to memory of 1396	1528	winrar-x84.exe	44
PID 1528 wrote to memory of 1396	1528	winrar-x84.exe	44
PID 1528 wrote to memory of 1864	1528	winrar-x84.exe	46
PID 1528 wrote to memory of 1864	1528	winrar-x84.exe	46
PID 1528 wrote to memory of 1864	1528	winrar-x84.exe	46
PID 1528 wrote to memory of 1388	1528	winrar-x84.exe	48
PID 1528 wrote to memory of 1388	1528	winrar-x84.exe	48
PID 1528 wrote to memory of 1388	1528	winrar-x84.exe	48
PID 1528 wrote to memory of 268	1528	winrar-x84.exe	50
PID 1528 wrote to memory of 268	1528	winrar-x84.exe	50
PID 1528 wrote to memory of 268	1528	winrar-x84.exe	50
PID 1064 wrote to memory of 544	1064	cmd.exe	51
PID 1064 wrote to memory of 544	1064	cmd.exe	51
PID 1064 wrote to memory of 544	1064	cmd.exe	51
PID 1064 wrote to memory of 544	1064	cmd.exe	51

C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe
"C:\Users\Admin\AppData\Local\Temp\4ced2056e4efe1c93b9f4adaaeaba20c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1184
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\wSmIzsMZSTGIPjXygtTeiEZYkIjJjD.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1812
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Roaming\WinRAR\wAcLjfo4uMcnTa1rAjnz0eLcoo04D9.bat" "
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1264
  - - C:\Users\Admin\AppData\Roaming\WinRAR\HoykwG9pmLZ7sZbSP8eb.exe
      HoykwG9pmLZ7sZbSP8eb.exe -p2e840a597483ac4423c7c5ec1a09b39042cbf75d
      4⤵
      Executes dropped EXE
      Suspicious use of WriteProcessMemory
      PID:1252
    - - C:\Windows\SysWOW64\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\WinRAR\tPKG2uMJtmCS4Bv6TMepBvdoqxAPGa.vbe"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1028
      - C:\Windows\SysWOW64\cmd.exe
        
        cmd /c ""C:\Users\Admin\AppData\Roaming\WinRAR\mQE440b4P9lIBPO3Qboqf8inqaQoJr.bat" "
        6⤵
        Loads dropped DLL
        Suspicious use of WriteProcessMemory
        
        PID:1064
        
        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 Program Files directory
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1528
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Recovery\a7611f42-198c-11eb-8a49-ee401b9e63cb\WmiPrvSE.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1636
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1856
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "wininit" /sc ONLOGON /tr "'C:\PerfLogs\Admin\wininit.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1188
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\WindowsPowerShell\Modules\csrss.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1396
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Recovery\a7611f42-198c-11eb-8a49-ee401b9e63cb\sppsvc.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1864
        
        C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\PerfLogs\Admin\WmiPrvSE.exe'" /rl HIGHEST /f
        8⤵
        Creates scheduled task(s)
        
        PID:1388
        
        C:\PerfLogs\Admin\WmiPrvSE.exe
        
        "C:\PerfLogs\Admin\WmiPrvSE.exe"
        8⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:268
        
        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:544

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

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Downloads

memory/268-34-0x0000000000E10000-0x0000000000E11000-memory.dmp

Filesize
4KB

Download
memory/268-32-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/1028-15-0x00000000026F0000-0x00000000026F4000-memory.dmp

Filesize
16KB

Download
memory/1528-21-0x0000000000120000-0x0000000000121000-memory.dmp

Filesize
4KB

Download
memory/1528-20-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/1812-6-0x00000000026B0000-0x00000000026B4000-memory.dmp

Filesize
16KB

Download