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 7 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
		1568	schtasks.exe
		1908	schtasks.exe
		3896	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
		3924	schtasks.exe
		1808	schtasks.exe
		3676	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 6 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	1808	640	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3676	640	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3924	640	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1568	640	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1908	640	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3896	640	schtasks.exe	88

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c9c-10.dat	dcrat
behavioral2/memory/3908-13-0x0000000000A00000-0x0000000000AFA000-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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	SessionHostmonitorNetsavesHost.exe

Executes dropped EXE 2 IoCs

pid	Process
3908	SessionHostmonitorNetsavesHost.exe
1400	Registry.exe

Adds Run key to start application 2 TTPs 6 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\Registry = "\"C:\\Documents and Settings\\Registry.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\Program Files (x86)\\Internet Explorer\\ja-JP\\sysmon.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sysmon = "\"C:\\Windows\\bfsvc\\sysmon.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Program Files (x86)\\Windows Sidebar\\Shared Gadgets\\Registry.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SearchApp = "\"C:\\Windows\\SystemApps\\Microsoft.Windows.Search_cw5n1h2txyewy\\Cortana.Internal.Search\\SearchApp.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\Windows\\SysWOW64\\mfnetcore\\cmd.exe\""	SessionHostmonitorNetsavesHost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\mfnetcore\cmd.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\SysWOW64\mfnetcore\ebf1f9fa8afd6d1932bd65bc4cc3af89a4c8e228	SessionHostmonitorNetsavesHost.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Internet Explorer\ja-JP\sysmon.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Program Files (x86)\Internet Explorer\ja-JP\121e5b5079f7c0e46d90f99b3864022518bbbda9	SessionHostmonitorNetsavesHost.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\Registry.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\ee2ad38f3d43822fe0c92830b00d06adc71395d2	SessionHostmonitorNetsavesHost.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\bfsvc\sysmon.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\bfsvc\121e5b5079f7c0e46d90f99b3864022518bbbda9	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Cortana.Internal.Search\SearchApp.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Cortana.Internal.Search\38384e6a620884a6b69bcc56f80d556f9200171c	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

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.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

pid	Process
3896	schtasks.exe
1808	schtasks.exe
3676	schtasks.exe
3924	schtasks.exe
1568	schtasks.exe
1908	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3908	SessionHostmonitorNetsavesHost.exe
3908	SessionHostmonitorNetsavesHost.exe
3908	SessionHostmonitorNetsavesHost.exe
1400	Registry.exe
1400	Registry.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3908	SessionHostmonitorNetsavesHost.exe
Token: SeDebugPrivilege	1400	Registry.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3544 wrote to memory of 4964	3544	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	83
PID 3544 wrote to memory of 4964	3544	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	83
PID 3544 wrote to memory of 4964	3544	JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe	83
PID 4964 wrote to memory of 2164	4964	WScript.exe	85
PID 4964 wrote to memory of 2164	4964	WScript.exe	85
PID 4964 wrote to memory of 2164	4964	WScript.exe	85
PID 2164 wrote to memory of 3908	2164	cmd.exe	87
PID 2164 wrote to memory of 3908	2164	cmd.exe	87
PID 3908 wrote to memory of 1400	3908	SessionHostmonitorNetsavesHost.exe	96
PID 3908 wrote to memory of 1400	3908	SessionHostmonitorNetsavesHost.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\JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_45040416d519b7447a2a2ade5bd930e1.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3544
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\SessionHostmonitorNet\l7Qt4LA8iP1KynAPjmfGY.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4964
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\SessionHostmonitorNet\WqDHbfuIZom1r.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2164
  - - C:\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe
      "C:\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe"
      4⤵
      Checks computer location settings
      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:3908
    - - C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\Registry.exe
        
        "C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\Registry.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Documents and Settings\Registry.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\ja-JP\sysmon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\bfsvc\sysmon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\Registry.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\Cortana.Internal.Search\SearchApp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Windows\SysWOW64\mfnetcore\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3896

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:\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe

Filesize
970KB

MD5
489c2f03208d40a364b588418a03d764

SHA1
3e3cbe6fb776c71ea14c7043d3c8745d3f8b83cd

SHA256
28f0ee1231e99afde073db4e1b1a87c196dc365b27998642384f8a2d38efe5dc

SHA512
f3166f88cd89d767916710bb445bedf539e558ee8cb5088bc91ce8c657167f6a6d81900eea0def2171a42e87f91e67cf1f82f2958a7d574b4770fd37a80b0018

Download Submit
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
memory/1400-37-0x0000000001250000-0x000000000125C000-memory.dmp

Filesize
48KB

Download
memory/1400-38-0x0000000001260000-0x0000000001268000-memory.dmp

Filesize
32KB

Download
memory/3908-12-0x00007FFCD3A63000-0x00007FFCD3A65000-memory.dmp

Filesize
8KB

Download
memory/3908-13-0x0000000000A00000-0x0000000000AFA000-memory.dmp

Filesize
1000KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads