dcrat | d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75

General

Target

d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe
Size

1.5MB
MD5

bdf8dba699d63caad5ea9a29a0f6dfda
SHA1

60b104b39c4b843e982fba55dc94ca89c444a315
SHA256

d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75
SHA512

d2200cbbe4312dc5f0c57d45306ac1dd988f8b4892b036ca2b7f05bf0d75f213303b7d4e20a0e0b39862c0d59966468458ba37db084e1972b58b8a6ebce3fa6a
SSDEEP

24576:Q2G/nvxW3W8ARZJJJJjsJJJJvJHJJJJJJ/wYnWW5Yxwo06RF91aOd9lfLQP9gMsD:QbA34VAb5J8RFyA10DsGxpQ

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 7 IoCs

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

rat infostealer dcrat

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exed9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe

pid	process
2660	schtasks.exe
2336	schtasks.exe
1572	schtasks.exe
1720	schtasks.exe
2220	schtasks.exe
1448	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe

Dcrat family
dcrat

Process spawned unexpected child process 6 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	2656	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2336	2656	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1572	2656	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1720	2656	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2220	2656	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1448	2656	schtasks.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
\sessionMonitor\sessionMonitordriverCrtMonitor.exe	dcrat
behavioral1/memory/2364-13-0x0000000000F70000-0x000000000105C000-memory.dmp	dcrat
behavioral1/memory/1912-33-0x00000000013C0000-0x00000000014AC000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

Processes:

sessionMonitordriverCrtMonitor.exedllhost.exe

pid process

2364 sessionMonitordriverCrtMonitor.exe
1912 dllhost.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

2860 cmd.exe
2860 cmd.exe

pid	process
2364	sessionMonitordriverCrtMonitor.exe
1912	dllhost.exe

pid	process
2860	cmd.exe
2860	cmd.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

sessionMonitordriverCrtMonitor.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\Migration\\WTR\\sppsvc.exe\""	sessionMonitordriverCrtMonitor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPSVC\\OSPPSVC.exe\""	sessionMonitordriverCrtMonitor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\wzcdlg\\WmiPrvSE.exe\""	sessionMonitordriverCrtMonitor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\kbdnecat\\dllhost.exe\""	sessionMonitordriverCrtMonitor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\TSTheme\\spoolsv.exe\""	sessionMonitordriverCrtMonitor.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\sessionMonitor\\OSPPSVC.exe\""	sessionMonitordriverCrtMonitor.exe

Drops file in System32 directory 6 IoCs

Processes:

sessionMonitordriverCrtMonitor.exe

description	ioc	process
File created	C:\Windows\System32\wbem\wzcdlg\WmiPrvSE.exe	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\System32\wbem\wzcdlg\24dbde2999530ef5fd907494bc374d663924116c	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\System32\kbdnecat\dllhost.exe	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\System32\kbdnecat\5940a34987c99120d96dace90a3f93f329dcad63	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\System32\TSTheme\spoolsv.exe	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\System32\TSTheme\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	sessionMonitordriverCrtMonitor.exe

Drops file in Program Files directory 2 IoCs

Processes:

sessionMonitordriverCrtMonitor.exe

description	ioc	process
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPSVC\OSPPSVC.exe	sessionMonitordriverCrtMonitor.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPSVC\1610b97d3ab4a74cd8ae104b51bea7bfcc5b9c6f	sessionMonitordriverCrtMonitor.exe

Drops file in Windows directory 3 IoCs

Processes:

sessionMonitordriverCrtMonitor.exe

description	ioc	process
File opened for modification	C:\Windows\Migration\WTR\sppsvc.exe	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\Migration\WTR\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	sessionMonitordriverCrtMonitor.exe
File created	C:\Windows\Migration\WTR\sppsvc.exe	sessionMonitordriverCrtMonitor.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exeWScript.execmd.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid process

1448 schtasks.exe
2660 schtasks.exe
2336 schtasks.exe
1572 schtasks.exe
1720 schtasks.exe
2220 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

sessionMonitordriverCrtMonitor.exedllhost.exe

pid process

2364 sessionMonitordriverCrtMonitor.exe
2364 sessionMonitordriverCrtMonitor.exe
2364 sessionMonitordriverCrtMonitor.exe
1912 dllhost.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

sessionMonitordriverCrtMonitor.exedllhost.exe

description pid process

Token: SeDebugPrivilege 2364 sessionMonitordriverCrtMonitor.exe
Token: SeDebugPrivilege 1912 dllhost.exe

pid	process
1448	schtasks.exe
2660	schtasks.exe
2336	schtasks.exe
1572	schtasks.exe
1720	schtasks.exe
2220	schtasks.exe

pid	process
2364	sessionMonitordriverCrtMonitor.exe
2364	sessionMonitordriverCrtMonitor.exe
2364	sessionMonitordriverCrtMonitor.exe
1912	dllhost.exe

description	pid	process
Token: SeDebugPrivilege	2364	sessionMonitordriverCrtMonitor.exe
Token: SeDebugPrivilege	1912	dllhost.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exeWScript.execmd.exesessionMonitordriverCrtMonitor.execmd.exe

description	pid	process	target process
PID 2788 wrote to memory of 2708	2788	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe	WScript.exe
PID 2788 wrote to memory of 2708	2788	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe	WScript.exe
PID 2788 wrote to memory of 2708	2788	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe	WScript.exe
PID 2788 wrote to memory of 2708	2788	d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe	WScript.exe
PID 2708 wrote to memory of 2860	2708	WScript.exe	cmd.exe
PID 2708 wrote to memory of 2860	2708	WScript.exe	cmd.exe
PID 2708 wrote to memory of 2860	2708	WScript.exe	cmd.exe
PID 2708 wrote to memory of 2860	2708	WScript.exe	cmd.exe
PID 2860 wrote to memory of 2364	2860	cmd.exe	sessionMonitordriverCrtMonitor.exe
PID 2860 wrote to memory of 2364	2860	cmd.exe	sessionMonitordriverCrtMonitor.exe
PID 2860 wrote to memory of 2364	2860	cmd.exe	sessionMonitordriverCrtMonitor.exe
PID 2860 wrote to memory of 2364	2860	cmd.exe	sessionMonitordriverCrtMonitor.exe
PID 2364 wrote to memory of 316	2364	sessionMonitordriverCrtMonitor.exe	cmd.exe
PID 2364 wrote to memory of 316	2364	sessionMonitordriverCrtMonitor.exe	cmd.exe
PID 2364 wrote to memory of 316	2364	sessionMonitordriverCrtMonitor.exe	cmd.exe
PID 316 wrote to memory of 1280	316	cmd.exe	w32tm.exe
PID 316 wrote to memory of 1280	316	cmd.exe	w32tm.exe
PID 316 wrote to memory of 1280	316	cmd.exe	w32tm.exe
PID 316 wrote to memory of 1912	316	cmd.exe	dllhost.exe
PID 316 wrote to memory of 1912	316	cmd.exe	dllhost.exe
PID 316 wrote to memory of 1912	316	cmd.exe	dllhost.exe

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\d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe
"C:\Users\Admin\AppData\Local\Temp\d9bfa2b5b08b1708ce9083cd1ce174e5f38fc7e92e17aa2148a5b1a388b27f75.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2788
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\sessionMonitor\yKWvGem3BjBd.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2708
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\sessionMonitor\sAhrfeOmh26XUgm.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2860
  - - C:\sessionMonitor\sessionMonitordriverCrtMonitor.exe
      "C:\sessionMonitor\sessionMonitordriverCrtMonitor.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2364
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\TFjl6yEZQn.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:316
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1280
      - C:\Windows\System32\kbdnecat\dllhost.exe
        
        "C:\Windows\System32\kbdnecat\dllhost.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\Migration\WTR\sppsvc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPSVC\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2336

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\wzcdlg\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\kbdnecat\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\TSTheme\spoolsv.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\sessionMonitor\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1448

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

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\TFjl6yEZQn.bat

Filesize
204B

MD5
45eeb0db16d32eb68676d8a2efeeaccc

SHA1
c67c606a6a47440f3a2710e9731a28cb36221d78

SHA256
a23a4842156388bbdff18c06d1c157edc898880112f4cccbfc764bf01d944914

SHA512
038cf3cdd529876d01d2532871bb03aea905cd0449b54ffc383525f80568c05e42dcff33b93f2a1dbf591e016b44537cc71c0e006abf73ac89ab747533585e3b

Download Submit
C:\sessionMonitor\sAhrfeOmh26XUgm.bat

Filesize
54B

MD5
b768018829ff0d793581de74a77fefbc

SHA1
7ed52d592e48aae0f2c6d787848a551733da0992

SHA256
3c4f92a5815ed7905dcf662250f92066291dd1fe3d72778ddcc5618c6fd9ac1e

SHA512
c06ae8e9b5e60c7013673dc8786f8a4e0bb5749af0ed9766935a103d866ce0e79feb49fa5db02d34cdf4f93d74152852bd88cdbbbff78fc72e6a74a0d7581f91

Download Submit
C:\sessionMonitor\yKWvGem3BjBd.vbe

Filesize
206B

MD5
c71311d680117ae76fd803c7729b0f2e

SHA1
71b4746c7a7c7d13af5ef8f08e2cf7e5a8bf0c5c

SHA256
1028dc026cf11c71dcfd49ffe23504013fa3b291c4a38d3554d31d9579083fe0

SHA512
ccc8a8ff690948f6b3158794636960483d2a7a38be8a6be6b1bee92d9684c06ec109831d50e3f39b0df0a319e788398136c4ca91e8de79cde3a0fef560bb7c06

Download Submit
\sessionMonitor\sessionMonitordriverCrtMonitor.exe

Filesize
912KB

MD5
ad4510fe830bfd34f52dff2e550ceda8

SHA1
e5c892210dfa873f5de94f391586333af3a0e4e6

SHA256
1623da1c762e72dc669be09129c7b0f201fc315f98dbefbc12ee3b8da2473a14

SHA512
a1dcc93cfa30187137d6a06bd0f8aa7d2d5b43c09029a5df206682b90b070c1c57357aed38a9d98e527409a7dfffbe9ec22b4818a1643573028e2db219ddd836

Download Submit
memory/1912-33-0x00000000013C0000-0x00000000014AC000-memory.dmp

Filesize
944KB

Download
memory/2364-13-0x0000000000F70000-0x000000000105C000-memory.dmp

Filesize
944KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads