dcrat | d28b646c459395738563e52b8ec7e831da311cb91c7b627aa5c9268117c32337

General

Target

e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
Size

1.4MB
MD5

e9b76dd40f3d6b54aeb329467f261094
SHA1

f9c949ff9fee524fb7eefa3ce816adce0c1d78fd
SHA256

d28b646c459395738563e52b8ec7e831da311cb91c7b627aa5c9268117c32337
SHA512

3fb509e2b042d3abc89a3c72d3df7a45561461eeb4f39e1cce1f2c1d939b6206a898507a0074d2c1c24a80fb18e12b4e4c555a2dea5e8b3c563c6ea2e0bdee04
SSDEEP

24576:W2G/nvxW3W12U3WE31ghc4xzo3WdXRupmYvjfk19F37MSxTi/DJlT+4n:WbA3CWVCh3WLkmYrfKg/DiI

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 8 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		3520	schtasks.exe
		2568	schtasks.exe
		4056	schtasks.exe
		2996	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
		3100	schtasks.exe
		3044	schtasks.exe
		216	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 7 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	3100	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3044	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	216	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3520	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2568	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4056	2160	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2996	2160	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b6d-10.dat	dcrat
behavioral2/memory/876-13-0x0000000000CE0000-0x0000000000DF6000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	RuntimeperfnetDriversavesdll.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe

Executes dropped EXE 2 IoCs

pid	Process
876	RuntimeperfnetDriversavesdll.exe
3588	sihost.exe

Adds Run key to start application 2 TTPs 7 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\smss = "\"C:\\PerfLogs\\smss.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sihost = "\"C:\\Windows\\System32\\cfmifsproxy\\sihost.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\Windows\\SysWOW64\\MbaeApiPublic\\cmd.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Documents and Settings\\smss.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Documents and Settings\\conhost.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\twain_32\\explorer.exe\""	RuntimeperfnetDriversavesdll.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeperfnetDriversavesdll = "\"C:\\Documents and Settings\\RuntimeperfnetDriversavesdll.exe\""	RuntimeperfnetDriversavesdll.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\System32\cfmifsproxy\sihost.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\System32\cfmifsproxy\66fc9ff0ee96c2b21f0cfded48750ae9e3032bf3	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\SysWOW64\MbaeApiPublic\cmd.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\SysWOW64\MbaeApiPublic\ebf1f9fa8afd6d1932bd65bc4cc3af89a4c8e228	RuntimeperfnetDriversavesdll.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\twain_32\explorer.exe	RuntimeperfnetDriversavesdll.exe
File created	C:\Windows\twain_32\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	RuntimeperfnetDriversavesdll.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	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2996	schtasks.exe
3100	schtasks.exe
3044	schtasks.exe
216	schtasks.exe
3520	schtasks.exe
2568	schtasks.exe
4056	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
876	RuntimeperfnetDriversavesdll.exe
876	RuntimeperfnetDriversavesdll.exe
876	RuntimeperfnetDriversavesdll.exe
3588	sihost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	876	RuntimeperfnetDriversavesdll.exe
Token: SeDebugPrivilege	3588	sihost.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 1144	2228	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	82
PID 2228 wrote to memory of 1144	2228	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	82
PID 2228 wrote to memory of 1144	2228	e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe	82
PID 1144 wrote to memory of 4196	1144	WScript.exe	83
PID 1144 wrote to memory of 4196	1144	WScript.exe	83
PID 1144 wrote to memory of 4196	1144	WScript.exe	83
PID 4196 wrote to memory of 876	4196	cmd.exe	85
PID 4196 wrote to memory of 876	4196	cmd.exe	85
PID 876 wrote to memory of 3588	876	RuntimeperfnetDriversavesdll.exe	96
PID 876 wrote to memory of 3588	876	RuntimeperfnetDriversavesdll.exe	96

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\e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\e9b76dd40f3d6b54aeb329467f261094_JaffaCakes118.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2228
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Runtimeperfnet\1syNKYwmRXGdL3fLPtIqT.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1144
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Runtimeperfnet\ZSSFBj4h8UyaWrgI.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4196
  - - C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.exe
      "C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:876
    - - C:\Windows\System32\cfmifsproxy\sihost.exe
        
        "C:\Windows\System32\cfmifsproxy\sihost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3588

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeperfnetDriversavesdll" /sc ONLOGON /tr "'C:\Documents and Settings\RuntimeperfnetDriversavesdll.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\PerfLogs\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\cfmifsproxy\sihost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Windows\SysWOW64\MbaeApiPublic\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Documents and Settings\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Documents and Settings\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\twain_32\explorer.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2996

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

2

T1012

System Information Discovery

2

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:\Runtimeperfnet\1syNKYwmRXGdL3fLPtIqT.vbe

Filesize
207B

MD5
37cf337b8f57bdb83988391601c164fd

SHA1
3addd11c005d3f111b5158b114b0dc8b9ee9836e

SHA256
c91a015ddbed9ee199867730961b1ee293cf257b0abc260d35e53dc23b8a87af

SHA512
d3a2c40786628a01b37c93e20f9d82512a5c53881b7f6db5e5babd4f7e92893526a794dc5652f3cf342bed40eb3a4a56e2404b0198f7b24093958ac825b49451

Download Submit
C:\Runtimeperfnet\RuntimeperfnetDriversavesdll.exe

Filesize
1.1MB

MD5
8169d77b386f287c2a82e16b4946eec3

SHA1
40d37a341d757efa9f3bdccecd76d7bd4aa76827

SHA256
12215f07467ec46ec06d2a1c734dc0dc40d66c3b27bcebaebbdc3f0f0792c450

SHA512
9d82106531ddf6d452b229977956aa719b1f0ad7b20fdc328ec6b0bcd7e7915a132df12087f1c87e835808d4c8763e167f7ee9462ec1e53e3099fd4b34d18639

Download Submit
C:\Runtimeperfnet\ZSSFBj4h8UyaWrgI.bat

Filesize
52B

MD5
324b5e03c3a74a39afd97c6021786a36

SHA1
68e090d02ddef65f18fc7539cfca1851e3aee226

SHA256
ce90253c373590ee106fdf14419dbac112d81955c57c9194029bd462bd90d3ec

SHA512
8f6f45347b682baa3aa4e5307586f6c29dc6d6fb557427e887950bf947bde2bab3cecedfd70caabfa6ec5d22041988c59a096fce3224bb0d71bc3d8afcef28bd

Download Submit
memory/876-12-0x00007FFC7E803000-0x00007FFC7E805000-memory.dmp

Filesize
8KB

Download
memory/876-13-0x0000000000CE0000-0x0000000000DF6000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads