dcrat | 94ce5a41f89b1be0c2b093849cebc9d4da540feeff64daceaa6439f0b4b573eb

General

Target

JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe
Size

1.4MB
MD5

4dba0b8b53a6226666269bcda873575f
SHA1

78174bfbd82c6ff0337a6e6199ac3e409c955e66
SHA256

94ce5a41f89b1be0c2b093849cebc9d4da540feeff64daceaa6439f0b4b573eb
SHA512

b993ca457e337a9c292c2cc0f36170cbcf231f1c30ba9887638428904df50fef30d898f4ff21699ec1b1c62ddc70465e508699f5182ee7802f870fd5a577642b
SSDEEP

24576:U2G/nvxW3Ww0teGfgcsVTdE507cQtHpq/KKvxUGLF+4R:UbA30l45t3lpqjo2

Score

10^/10

dcrat discovery evasion 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe
		4892	schtasks.exe
		4512	schtasks.exe
		2844	schtasks.exe
		4672	schtasks.exe
		1096	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	4892	4860	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4512	4860	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2844	4860	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4672	4860	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1096	4860	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023ca5-10.dat	dcrat
behavioral2/memory/456-13-0x00000000007C0000-0x00000000008E4000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	SessionHostmonitorNetsavesHost.exe

Executes dropped EXE 2 IoCs

pid	Process
456	SessionHostmonitorNetsavesHost.exe
3956	SppExtComObj.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\winlogon = "\"C:\\Users\\Public\\Documents\\winlogon.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:\\Users\\All Users\\Oracle\\Java\\.oracle_jre_usage\\TextInputHost.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\ProgramData\\ssh\\OfficeClickToRun.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Windows\\System32\\AppointmentActivation\\SppExtComObj.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\StartMenuExperienceHost = "\"C:\\Windows\\SystemApps\\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\\StartMenuExperienceHost\\StartMenuExperienceHost.exe\""	SessionHostmonitorNetsavesHost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\AppointmentActivation\SppExtComObj.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\AppointmentActivation\e1ef82546f0b02b7e974f28047f3788b1128cce1	SessionHostmonitorNetsavesHost.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost\StartMenuExperienceHost.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost\55b276f4edf653fe07efe8f1ecc32d3d195abd16	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 4 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_4dba0b8b53a6226666269bcda873575f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000_Classes\Local Settings	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1424	reg.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
4512	schtasks.exe
2844	schtasks.exe
4672	schtasks.exe
1096	schtasks.exe
4892	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
456	SessionHostmonitorNetsavesHost.exe
456	SessionHostmonitorNetsavesHost.exe
456	SessionHostmonitorNetsavesHost.exe
456	SessionHostmonitorNetsavesHost.exe
456	SessionHostmonitorNetsavesHost.exe
456	SessionHostmonitorNetsavesHost.exe
3956	SppExtComObj.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	456	SessionHostmonitorNetsavesHost.exe
Token: SeDebugPrivilege	3956	SppExtComObj.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 3548 wrote to memory of 720	3548	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	83
PID 3548 wrote to memory of 720	3548	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	83
PID 3548 wrote to memory of 720	3548	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	83
PID 720 wrote to memory of 2604	720	WScript.exe	84
PID 720 wrote to memory of 2604	720	WScript.exe	84
PID 720 wrote to memory of 2604	720	WScript.exe	84
PID 2604 wrote to memory of 456	2604	cmd.exe	86
PID 2604 wrote to memory of 456	2604	cmd.exe	86
PID 456 wrote to memory of 3956	456	SessionHostmonitorNetsavesHost.exe	94
PID 456 wrote to memory of 3956	456	SessionHostmonitorNetsavesHost.exe	94
PID 2604 wrote to memory of 1424	2604	cmd.exe	95
PID 2604 wrote to memory of 1424	2604	cmd.exe	95
PID 2604 wrote to memory of 1424	2604	cmd.exe	95

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_4dba0b8b53a6226666269bcda873575f.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3548
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\JEDcOjKcz5t.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:720
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\vkBwAxiibpq4vERKhn6zEWt.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2604
  - - C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe
      "C:\Users\Admin\AppData\Local\Temp\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 Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:456
    - - C:\Windows\System32\AppointmentActivation\SppExtComObj.exe
        
        "C:\Windows\System32\AppointmentActivation\SppExtComObj.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3956
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:1424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\Public\Documents\winlogon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4892

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Users\All Users\Oracle\Java\.oracle_jre_usage\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\ProgramData\ssh\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\AppointmentActivation\SppExtComObj.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1096

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

2

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\JEDcOjKcz5t.vbe

Filesize
225B

MD5
2962f49d50c7a201daa7f3e462dabe16

SHA1
08b5ee7e587d8fb41f47f9968baf4e14140a3bf7

SHA256
e930fcc50609e2bc6697991c9929b0e448c2a1f00334322388ceac4dad198073

SHA512
31993fe779cffdfad67990b99ba3dde79f1b0bff443a9203d5d392968d106aee95b58cee5aabccb34503428f9f0e8ef1d6456ef3f5ba8458cf3b1dd2848493e7

Download Submit
C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe

Filesize
1.1MB

MD5
d2887b8a1e477a97c84e4b126cb360a3

SHA1
8fb6cdbc31616bd460e703b5bcb77367321c5c8a

SHA256
ecfdb52196e58db344d66e7ec2e65cb589315dd7bed55bc2a0fe6afe86898433

SHA512
0691b082aba27120413d99749edd4da34e39488ec3da3e325c93dd36a64b725e7d1623b62b87f4a1b064ee42c2c60e05f0d6d0f7520e81b8b7753820446a667b

Download Submit
C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\vkBwAxiibpq4vERKhn6zEWt.bat

Filesize
177B

MD5
d742136b1fb637ca2ea95803cee64dbf

SHA1
6949f1f2567e7765b018b838b8a656e0f8f7da04

SHA256
d0f7b632a8497a14da1da3ee1182e9f69fc3c24d28db709f944fa1121a0fb0a4

SHA512
38e357d2777de646632d52a3eaca458c7e85202afc041d3df214afe13bb5b731013f2742573ebb406c505bbf73692c037ecc58785ed347a3af618ffd6448e302

Download Submit
memory/456-12-0x00007FFE387D3000-0x00007FFE387D5000-memory.dmp

Filesize
8KB

Download
memory/456-13-0x00000000007C0000-0x00000000008E4000-memory.dmp

Filesize
1.1MB

Download
memory/3956-35-0x0000000002F00000-0x0000000002F0C000-memory.dmp

Filesize
48KB

Download
memory/3956-36-0x0000000002F10000-0x0000000002F1C000-memory.dmp

Filesize
48KB

Download
memory/3956-38-0x000000001B830000-0x000000001B83C000-memory.dmp

Filesize
48KB

Download
memory/3956-37-0x0000000002F20000-0x0000000002F2C000-memory.dmp

Filesize
48KB

Download
memory/3956-40-0x000000001B860000-0x000000001B86A000-memory.dmp

Filesize
40KB

Download
memory/3956-39-0x000000001B840000-0x000000001B848000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads