dcrat | f7a57529f19db7d7441e106f36a9c50930df5008669847a7d2625f184c76b26c

General

Target

JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
Size

1.2MB
MD5

45040416d519b7447a2a2ade5bd930e1
SHA1

acd8113a92ac889e8155353ad7b273fd277652d0
SHA256

f7a57529f19db7d7441e106f36a9c50930df5008669847a7d2625f184c76b26c
SHA512

e9d2323bb20daaf073cb5536942b8db7e2a8b63705ec4913ffe18cf935372a6e72f7a1946c0b1ecc8b973077c4972ba15dd3b3b52f05c3f3d3f93118312f35f9
SSDEEP

24576:u2G/nvxW3WieCeBHFKDfzK4x2jlGhn/KefXD7H44Z+43:ubA3jeHFKzO+swX/E6

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 6 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		2064	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
		1152	schtasks.exe
		1096	schtasks.exe
		828	schtasks.exe
		1440	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 5 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	1152	2024	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1096	2024	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	828	2024	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1440	2024	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2064	2024	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000015d7f-9.dat	dcrat
behavioral1/memory/2568-13-0x0000000000DC0000-0x0000000000EBA000-memory.dmp	dcrat
behavioral1/memory/1248-31-0x0000000001170000-0x000000000126A000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2568	SessionHostmonitorNetsavesHost.exe
1248	winlogon.exe

Loads dropped DLL 2 IoCs

pid	Process
2684	cmd.exe
2684	cmd.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SessionHostmonitorNetsavesHost = "\"C:\\SessionHostmonitorNet\\WqDHbfuIZom1r\\SessionHostmonitorNetsavesHost.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\twunk_32\\explorer.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\PerfLogs\\Admin\\System.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Program Files\\MSBuild\\Microsoft\\Windows Workflow Foundation\\v3.5\\winlogon.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\sxsstore\\services.exe\""	SessionHostmonitorNetsavesHost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\sxsstore\services.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\sxsstore\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	SessionHostmonitorNetsavesHost.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\winlogon.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\cc11b995f2a76da408ea6a601e682e64743153ad	SessionHostmonitorNetsavesHost.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\twunk_32\explorer.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\twunk_32\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	SessionHostmonitorNetsavesHost.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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.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 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
1152	schtasks.exe
1096	schtasks.exe
828	schtasks.exe
1440	schtasks.exe
2064	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2568	SessionHostmonitorNetsavesHost.exe
1248	winlogon.exe
1248	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2568	SessionHostmonitorNetsavesHost.exe
Token: SeDebugPrivilege	1248	winlogon.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2696 wrote to memory of 2608	2696	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	30
PID 2696 wrote to memory of 2608	2696	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	30
PID 2696 wrote to memory of 2608	2696	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	30
PID 2696 wrote to memory of 2608	2696	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	30
PID 2608 wrote to memory of 2684	2608	WScript.exe	31
PID 2608 wrote to memory of 2684	2608	WScript.exe	31
PID 2608 wrote to memory of 2684	2608	WScript.exe	31
PID 2608 wrote to memory of 2684	2608	WScript.exe	31
PID 2684 wrote to memory of 2568	2684	cmd.exe	33
PID 2684 wrote to memory of 2568	2684	cmd.exe	33
PID 2684 wrote to memory of 2568	2684	cmd.exe	33
PID 2684 wrote to memory of 2568	2684	cmd.exe	33
PID 2568 wrote to memory of 3040	2568	SessionHostmonitorNetsavesHost.exe	40
PID 2568 wrote to memory of 3040	2568	SessionHostmonitorNetsavesHost.exe	40
PID 2568 wrote to memory of 3040	2568	SessionHostmonitorNetsavesHost.exe	40
PID 3040 wrote to memory of 2100	3040	cmd.exe	42
PID 3040 wrote to memory of 2100	3040	cmd.exe	42
PID 3040 wrote to memory of 2100	3040	cmd.exe	42
PID 3040 wrote to memory of 1248	3040	cmd.exe	43
PID 3040 wrote to memory of 1248	3040	cmd.exe	43
PID 3040 wrote to memory of 1248	3040	cmd.exe	43

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\JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2696
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\SessionHostmonitorNet\l7Qt4LA8iP1KynAPjmfGY.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2608
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\SessionHostmonitorNet\WqDHbfuIZom1r.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2684
  - - C:\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe
      "C:\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.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:2568
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\rofpxow7k6.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3040
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:2100
      - C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\winlogon.exe
        
        "C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\winlogon.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\PerfLogs\Admin\System.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1152

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\winlogon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1096

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\sxsstore\services.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SessionHostmonitorNetsavesHost" /sc ONLOGON /tr "'C:\SessionHostmonitorNet\WqDHbfuIZom1r\SessionHostmonitorNetsavesHost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\twunk_32\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2064

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\SessionHostmonitorNet\WqDHbfuIZom1r.bat

Filesize
72B

MD5
18496ae7e3aed282f98f45acec37dd3c

SHA1
f7b318ccb7024ecefcef4e80fe9a778472f55265

SHA256
2a9d21f9fe7245b3141678d7bb4da0e4e9e72336b66015b6905a44717c4debb8

SHA512
0d9dfec7d3435643989f3afe0fa57876d2e6a9a8a9caebb96aa2b29ba4c61c7d8e38128333b91ad2092061bccaa070f3a7ca15b720986a49071115283fc78f4f

Download Submit
C:\SessionHostmonitorNet\l7Qt4LA8iP1KynAPjmfGY.vbe

Filesize
222B

MD5
65c164be50684e9e4fc454d592da65f9

SHA1
9e228ef896eba663e4f8490c2e8322cb920be6b2

SHA256
230b38e2ecb8545890f4249349b6c7e41e048e601446a7107184da19ac87bfef

SHA512
fdc602fec0637a4ec3101994917a8b76543381a5b80a00619b21361f7628b7fc5d6c45df71f69a7b9a17f71fc4a2e106f524c4e8f50a7555c3124e821968f703

Download Submit
C:\Users\Admin\AppData\Local\Temp\rofpxow7k6.bat

Filesize
244B

MD5
3cf8d50d68f3d31533668e182f7796c2

SHA1
a82a338965128831c062eb9e1da4bfbb7e69f6ab

SHA256
5e2942c6d42bcbfff1935a7a919cb7c5904bd87bd1fc1ea3fe11f1afef2457d0

SHA512
22f71865a8b2479f809237e89cff0bffcb9f12ddab11e25151c7bfa154b5e99630f891bb89aa7b7b4c089fcde87b0b3c506042b4600078495439bf59fddf78ef

Download Submit
\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe

Filesize
970KB

MD5
489c2f03208d40a364b588418a03d764

SHA1
3e3cbe6fb776c71ea14c7043d3c8745d3f8b83cd

SHA256
28f0ee1231e99afde073db4e1b1a87c196dc365b27998642384f8a2d38efe5dc

SHA512
f3166f88cd89d767916710bb445bedf539e558ee8cb5088bc91ce8c657167f6a6d81900eea0def2171a42e87f91e67cf1f82f2958a7d574b4770fd37a80b0018

Download Submit
memory/1248-31-0x0000000001170000-0x000000000126A000-memory.dmp

Filesize
1000KB

Download
memory/1248-32-0x0000000000250000-0x000000000025C000-memory.dmp

Filesize
48KB

Download
memory/1248-33-0x0000000000260000-0x0000000000268000-memory.dmp

Filesize
32KB

Download
memory/2568-13-0x0000000000DC0000-0x0000000000EBA000-memory.dmp

Filesize
1000KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads