dcrat | 2f1ba0d2a1aaa17d2a8f8f9f97b9f553b1dc9e7d32039cf36382bddcebbfdaef

Analysis

max time kernel
121s
max time network
164s
platform
windows7_x64
resource
win7v20210410
submitted
02/08/2021, 20:43

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General

Target
560df81553f2ef8daf7019589f991c6d.exe
Size 549KB
Sample210802-9jcpaffkw2
SHA256 2f1ba0d2a1aaa17d2a8f8f9f97b9f553b1dc9e7d32039cf36382bddcebbfdaef
MD5 560df81553f2ef8daf7019589f991c6d
SHA1 a5fb46830c076f1d4742b6a25d3df613bfb7d2f5
SHA512 70fd49763c6ef90c62aa2578bbe533a86a203b3c7289d1a56b530efd6ea29ae0baf769817cc828ba7e384ed9ec7a4b61c8b2aa122be0500a54f2b576059178e3
MD5 SHA1 SHA512

Score

10^/10

dcrat evasion infostealer persistence rat spyware stealer trojan

Malware Config

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral1/memory/1936-82-0x0000000000AC0000-0x0000000000AC2000-memory.dmp	disable_win_def

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Process spawned unexpected child process 13 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	1340	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	652	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	796	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1480	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1792	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1140	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1644	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1828	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1524	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1628	1688	schtasks.exe	27
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	268	1688	schtasks.exe	27

DCRat Payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0005000000013105-75.dat	dcrat
behavioral1/files/0x0005000000013105-77.dat	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1936	winlogon.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

Windows security modification 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Features	winlogon.exe

Adds Run key to start application 2 TTPs 13 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\MSOCache\\All Users\\{90140000-0018-0409-0000-0000000FF1CE}-C\\taskhost.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\msgsm32\\smss.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\PerfLogs\\Admin\\taskhost.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\SSShim\\dwm.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\ProgramData\\Mozilla\\updates\\308046B0AF4A39CB\\dwm.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\MSOCache\\All Users\\{90140000-0115-0409-0000-0000000FF1CE}-C\\1033\\winlogon.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\PerfLogs\\Admin\\lsass.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\tspkg\\WmiPrvSE.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\prntvpt\\smss.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\560df81553f2ef8daf7019589f991c6d = "\"C:\\Users\\Default User\\560df81553f2ef8daf7019589f991c6d.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\C_1047\\csrss.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\MSOCache\\All Users\\{90140000-0117-0409-0000-0000000FF1CE}-C\\Access.en-us\\explorer.exe\""	560df81553f2ef8daf7019589f991c6d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\apss\\services.exe\""	560df81553f2ef8daf7019589f991c6d.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\System32\SSShim\6cb0b6c459d5d3455a3da700e713f2e2529862ff	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\C_1047\csrss.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\wbem\tspkg\24dbde2999530ef5fd907494bc374d663924116c	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\msgsm32\69ddcba757bf72f7d36c464c71f42baab150b2b9	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\apss\services.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\apss\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\wbem\tspkg\WmiPrvSE.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\msgsm32\smss.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\prntvpt\smss.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\prntvpt\69ddcba757bf72f7d36c464c71f42baab150b2b9	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\SSShim\dwm.exe	560df81553f2ef8daf7019589f991c6d.exe
File created	C:\Windows\System32\C_1047\886983d96e3d3e31032c679b2d4ea91b6c05afef	560df81553f2ef8daf7019589f991c6d.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 13 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1792	schtasks.exe
1140	schtasks.exe
1644	schtasks.exe
1524	schtasks.exe
1340	schtasks.exe
1504	schtasks.exe
1480	schtasks.exe
1828	schtasks.exe
2032	schtasks.exe
1628	schtasks.exe
268	schtasks.exe
652	schtasks.exe
796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1304	560df81553f2ef8daf7019589f991c6d.exe
960	560df81553f2ef8daf7019589f991c6d.exe
1936	winlogon.exe
584	powershell.exe
584	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1304	560df81553f2ef8daf7019589f991c6d.exe
Token: SeDebugPrivilege	960	560df81553f2ef8daf7019589f991c6d.exe
Token: SeDebugPrivilege	1936	winlogon.exe
Token: SeDebugPrivilege	584	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1304 wrote to memory of 528	1304	560df81553f2ef8daf7019589f991c6d.exe	37
PID 1304 wrote to memory of 528	1304	560df81553f2ef8daf7019589f991c6d.exe	37
PID 1304 wrote to memory of 528	1304	560df81553f2ef8daf7019589f991c6d.exe	37
PID 528 wrote to memory of 2036	528	cmd.exe	39
PID 528 wrote to memory of 2036	528	cmd.exe	39
PID 528 wrote to memory of 2036	528	cmd.exe	39
PID 528 wrote to memory of 864	528	cmd.exe	40
PID 528 wrote to memory of 864	528	cmd.exe	40
PID 528 wrote to memory of 864	528	cmd.exe	40
PID 528 wrote to memory of 960	528	cmd.exe	41
PID 528 wrote to memory of 960	528	cmd.exe	41
PID 528 wrote to memory of 960	528	cmd.exe	41
PID 960 wrote to memory of 944	960	560df81553f2ef8daf7019589f991c6d.exe	49
PID 960 wrote to memory of 944	960	560df81553f2ef8daf7019589f991c6d.exe	49
PID 960 wrote to memory of 944	960	560df81553f2ef8daf7019589f991c6d.exe	49
PID 944 wrote to memory of 1744	944	cmd.exe	50
PID 944 wrote to memory of 1744	944	cmd.exe	50
PID 944 wrote to memory of 1744	944	cmd.exe	50
PID 944 wrote to memory of 1664	944	cmd.exe	51
PID 944 wrote to memory of 1664	944	cmd.exe	51
PID 944 wrote to memory of 1664	944	cmd.exe	51
PID 944 wrote to memory of 1936	944	cmd.exe	52
PID 944 wrote to memory of 1936	944	cmd.exe	52
PID 944 wrote to memory of 1936	944	cmd.exe	52
PID 1936 wrote to memory of 584	1936	winlogon.exe	53
PID 1936 wrote to memory of 584	1936	winlogon.exe	53
PID 1936 wrote to memory of 584	1936	winlogon.exe	53

C:\Users\Admin\AppData\Local\Temp\560df81553f2ef8daf7019589f991c6d.exe
"C:\Users\Admin\AppData\Local\Temp\560df81553f2ef8daf7019589f991c6d.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1304
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\TUfgEpQzAl.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:528
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2036
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:864
- - C:\Users\Admin\AppData\Local\Temp\560df81553f2ef8daf7019589f991c6d.exe
    "C:\Users\Admin\AppData\Local\Temp\560df81553f2ef8daf7019589f991c6d.exe"
    3⤵
    - Adds Run key to start application
    - Drops file in System32 directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:960
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\G8r8YUXOOx.bat"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:944
    - - C:\Windows\system32\chcp.com
        
        chcp 65001
        5⤵
        
        PID:1744
    - - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        
        PID:1664
    - - C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\winlogon.exe
        
        "C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\winlogon.exe"
        5⤵
        Executes dropped EXE
        Windows security modification
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1936
      - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" Get-MpPreference -verbose
        6⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:584

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\PerfLogs\Admin\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\prntvpt\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "560df81553f2ef8daf7019589f991c6d" /sc ONLOGON /tr "'C:\Users\Default User\560df81553f2ef8daf7019589f991c6d.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\SSShim\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\C_1047\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\ProgramData\Mozilla\updates\308046B0AF4A39CB\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1140

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\PerfLogs\Admin\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\apss\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\tspkg\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1524

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\msgsm32\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:268

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

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

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Downloads

memory/584-90-0x0000000001EB0000-0x0000000001EB1000-memory.dmp

Download

memory/584-107-0x00000000028D0000-0x00000000028D1000-memory.dmp

Download

memory/584-91-0x00000000026C0000-0x00000000026C1000-memory.dmp

Download

memory/584-84-0x000007FEFBF11000-0x000007FEFBF13000-memory.dmp

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memory/584-86-0x000000001AB30000-0x000000001AB31000-memory.dmp

Download

memory/584-89-0x000000001AAB4000-0x000000001AAB6000-memory.dmp

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memory/584-88-0x000000001AAB0000-0x000000001AAB2000-memory.dmp

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memory/584-87-0x0000000002460000-0x0000000002461000-memory.dmp

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memory/584-106-0x0000000002730000-0x0000000002731000-memory.dmp

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memory/584-94-0x00000000026F0000-0x00000000026F1000-memory.dmp

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memory/584-85-0x0000000002050000-0x0000000002051000-memory.dmp

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memory/960-70-0x000000001B000000-0x000000001B002000-memory.dmp

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memory/960-68-0x0000000000150000-0x0000000000151000-memory.dmp

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memory/1304-60-0x0000000000EE0000-0x0000000000EE1000-memory.dmp

Download

memory/1304-62-0x000000001AD50000-0x000000001AD52000-memory.dmp

Download

memory/1936-82-0x0000000000AC0000-0x0000000000AC2000-memory.dmp

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memory/1936-81-0x0000000000160000-0x0000000000166000-memory.dmp

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memory/1936-80-0x000000001AE20000-0x000000001AE22000-memory.dmp

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memory/1936-78-0x00000000010F0000-0x00000000010F1000-memory.dmp

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