dcrat | db57de1bf0b133303c2325117a527f1586e4bf6af56219391a17095efb09cc76

Analysis

max time kernel
136s
max time network
199s
platform
windows7_x64
resource
win7v20210408
submitted
15-06-2021 17:57

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General

Target

8282EA0066E14F2E7CAF51B7A7D50DC1.exe
Size

1.0MB
MD5

8282ea0066e14f2e7caf51b7a7d50dc1
SHA1

83c03517bb11c4ef01ced0b8df76cb35acbf4fdd
SHA256

db57de1bf0b133303c2325117a527f1586e4bf6af56219391a17095efb09cc76
SHA512

b48e2b9c226f57c50b5e58d716a906e9753f254136697e3e32c5f6aba2c6cc0a3175b0b290630949ddb4229a8eda53e5b62d03c969f5ef187963302ecc9e6841

Score

10^/10

dcrat 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

DCRat Payload 6 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00050000000130e6-65.dat	dcrat
behavioral1/files/0x00050000000130e6-66.dat	dcrat
behavioral1/files/0x00050000000130e6-67.dat	dcrat
behavioral1/files/0x00050000000130e6-69.dat	dcrat
behavioral1/files/0x000300000001311e-82.dat	dcrat
behavioral1/files/0x000300000001311e-84.dat	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1548	fontruntime.exe
1564	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
1576	cmd.exe
1576	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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

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
5	ipinfo.io
6	ipinfo.io

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\C_10000\winlogon.exe	fontruntime.exe
File created	C:\Windows\System32\C_10000\cc11b995f2a76da408ea6a601e682e64743153ad	fontruntime.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\Setup\State\lsass.exe	fontruntime.exe
File opened for modification	C:\Windows\Setup\State\lsass.exe	fontruntime.exe
File created	C:\Windows\Setup\State\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	fontruntime.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 5 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
2012	schtasks.exe
1196	schtasks.exe
1692	schtasks.exe
2036	schtasks.exe
1972	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1380	PING.EXE

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1548	fontruntime.exe
1548	fontruntime.exe
1548	fontruntime.exe
1564	csrss.exe
1564	csrss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1564	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1548	fontruntime.exe
Token: SeDebugPrivilege	1564	csrss.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 652 wrote to memory of 1244	652	8282EA0066E14F2E7CAF51B7A7D50DC1.exe	29
PID 652 wrote to memory of 1244	652	8282EA0066E14F2E7CAF51B7A7D50DC1.exe	29
PID 652 wrote to memory of 1244	652	8282EA0066E14F2E7CAF51B7A7D50DC1.exe	29
PID 652 wrote to memory of 1244	652	8282EA0066E14F2E7CAF51B7A7D50DC1.exe	29
PID 1244 wrote to memory of 1576	1244	WScript.exe	30
PID 1244 wrote to memory of 1576	1244	WScript.exe	30
PID 1244 wrote to memory of 1576	1244	WScript.exe	30
PID 1244 wrote to memory of 1576	1244	WScript.exe	30
PID 1576 wrote to memory of 1548	1576	cmd.exe	32
PID 1576 wrote to memory of 1548	1576	cmd.exe	32
PID 1576 wrote to memory of 1548	1576	cmd.exe	32
PID 1576 wrote to memory of 1548	1576	cmd.exe	32
PID 1548 wrote to memory of 2012	1548	fontruntime.exe	34
PID 1548 wrote to memory of 2012	1548	fontruntime.exe	34
PID 1548 wrote to memory of 2012	1548	fontruntime.exe	34
PID 1548 wrote to memory of 1196	1548	fontruntime.exe	36
PID 1548 wrote to memory of 1196	1548	fontruntime.exe	36
PID 1548 wrote to memory of 1196	1548	fontruntime.exe	36
PID 1548 wrote to memory of 1692	1548	fontruntime.exe	38
PID 1548 wrote to memory of 1692	1548	fontruntime.exe	38
PID 1548 wrote to memory of 1692	1548	fontruntime.exe	38
PID 1548 wrote to memory of 2036	1548	fontruntime.exe	40
PID 1548 wrote to memory of 2036	1548	fontruntime.exe	40
PID 1548 wrote to memory of 2036	1548	fontruntime.exe	40
PID 1548 wrote to memory of 1972	1548	fontruntime.exe	42
PID 1548 wrote to memory of 1972	1548	fontruntime.exe	42
PID 1548 wrote to memory of 1972	1548	fontruntime.exe	42
PID 1548 wrote to memory of 920	1548	fontruntime.exe	44
PID 1548 wrote to memory of 920	1548	fontruntime.exe	44
PID 1548 wrote to memory of 920	1548	fontruntime.exe	44
PID 920 wrote to memory of 1664	920	cmd.exe	46
PID 920 wrote to memory of 1664	920	cmd.exe	46
PID 920 wrote to memory of 1664	920	cmd.exe	46
PID 920 wrote to memory of 1380	920	cmd.exe	47
PID 920 wrote to memory of 1380	920	cmd.exe	47
PID 920 wrote to memory of 1380	920	cmd.exe	47
PID 920 wrote to memory of 1564	920	cmd.exe	48
PID 920 wrote to memory of 1564	920	cmd.exe	48
PID 920 wrote to memory of 1564	920	cmd.exe	48

C:\Users\Admin\AppData\Local\Temp\8282EA0066E14F2E7CAF51B7A7D50DC1.exe
"C:\Users\Admin\AppData\Local\Temp\8282EA0066E14F2E7CAF51B7A7D50DC1.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:652
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\fontruntime\W54cK365JLW2iwfNl.vbe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1244
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\fontruntime\R8YG6c.bat" "
    3⤵
    - Loads dropped DLL
    - Suspicious use of WriteProcessMemory
    PID:1576
  - - C:\fontruntime\fontruntime.exe
      "C:\fontruntime\fontruntime.exe"
      4⤵
      Executes dropped EXE
      Drops file in System32 directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1548
    - - C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\Setup\State\lsass.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2012
    - - C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\34107922-98a6-11eb-a15f-ea91f6580701\wininit.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1196
    - - C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\C_10000\winlogon.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1692
    - - C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\Default\Downloads\spoolsv.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2036
    - - C:\Windows\system32\schtasks.exe
        
        "schtasks" /create /tn "csrss" /sc ONLOGON /tr "'C:\fontruntime\csrss.exe'" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1972
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\fontruntime\GMnfQCBNCG.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:920
      - C:\Windows\system32\chcp.com
        
        chcp 65001
        6⤵
        
        PID:1664
      - C:\Windows\system32\PING.EXE
        
        ping -n 5 localhost
        6⤵
        Runs ping.exe
        
        PID:1380
      - C:\fontruntime\csrss.exe
        
        "C:\fontruntime\csrss.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:1564

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Remote System Discovery

T1018

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/652-59-0x0000000075C31000-0x0000000075C33000-memory.dmp

Filesize
8KB

Download
memory/1548-72-0x000000001B0E0000-0x000000001B0E2000-memory.dmp

Filesize
8KB

Download
memory/1548-70-0x0000000001090000-0x0000000001091000-memory.dmp

Filesize
4KB

Download
memory/1564-85-0x0000000001180000-0x0000000001181000-memory.dmp

Filesize
4KB

Download
memory/1564-87-0x000000001B010000-0x000000001B012000-memory.dmp

Filesize
8KB

Download
memory/1564-88-0x0000000000590000-0x0000000000595000-memory.dmp

Filesize
20KB

Download
memory/1564-89-0x0000000000620000-0x0000000000624000-memory.dmp

Filesize
16KB

Download