dcrat | 94ce5a41f89b1be0c2b093849cebc9d4da540feeff64daceaa6439f0b4b573eb

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
07/01/2025, 04:31

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General

Target
JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe
Size 1.4MB
Sample250107-e5j57atrf1
SHA256 94ce5a41f89b1be0c2b093849cebc9d4da540feeff64daceaa6439f0b4b573eb
MD5 4dba0b8b53a6226666269bcda873575f
SHA1 78174bfbd82c6ff0337a6e6199ac3e409c955e66
SHA512 b993ca457e337a9c292c2cc0f36170cbcf231f1c30ba9887638428904df50fef30d898f4ff21699ec1b1c62ddc70465e508699f5182ee7802f870fd5a577642b
SSDEEP 24576:U2G/nvxW3Ww0teGfgcsVTdE507cQtHpq/KKvxUGLF+4R:UbA30l45t3lpqjo2
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat discovery evasion 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe
		1916	schtasks.exe
		2700	schtasks.exe
		2880	schtasks.exe
		2608	schtasks.exe
		2028	schtasks.exe
		2360	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	1916	3016	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2700	3016	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2880	3016	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2608	3016	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2028	3016	schtasks.exe	34
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2360	3016	schtasks.exe	34

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x00070000000192f0-9.dat	dcrat
behavioral1/memory/2268-13-0x0000000000F20000-0x0000000001044000-memory.dmp	dcrat
behavioral1/memory/1032-32-0x0000000000290000-0x00000000003B4000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Executes dropped EXE 2 IoCs

pid	Process
2268	SessionHostmonitorNetsavesHost.exe
1032	conhost.exe

Loads dropped DLL 2 IoCs

pid	Process
2336	cmd.exe
2336	cmd.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\dwm = "\"C:\\PerfLogs\\Admin\\dwm.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\addins\\csrss.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\normaliz\\taskhost.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\fwcfg\\WmiPrvSE.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Documents and Settings\\wininit.exe\""	SessionHostmonitorNetsavesHost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Windows\\System32\\C_860\\conhost.exe\""	SessionHostmonitorNetsavesHost.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File created	C:\Windows\System32\normaliz\taskhost.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\normaliz\b75386f1303e64d8139363b71e44ac16341adf4e	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\wbem\fwcfg\WmiPrvSE.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\wbem\fwcfg\24dbde2999530ef5fd907494bc374d663924116c	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\C_860\conhost.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\System32\C_860\088424020bedd6b28ac7fd22ee35dcd7322895ce	SessionHostmonitorNetsavesHost.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\addins\csrss.exe	SessionHostmonitorNetsavesHost.exe
File opened for modification	C:\Windows\addins\csrss.exe	SessionHostmonitorNetsavesHost.exe
File created	C:\Windows\addins\886983d96e3d3e31032c679b2d4ea91b6c05afef	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	reg.exe
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

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1016	reg.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
1916	schtasks.exe
2700	schtasks.exe
2880	schtasks.exe
2608	schtasks.exe
2028	schtasks.exe
2360	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2268	SessionHostmonitorNetsavesHost.exe
1032	conhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2268	SessionHostmonitorNetsavesHost.exe
Token: SeDebugPrivilege	1032	conhost.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 2260	1852	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	30
PID 1852 wrote to memory of 2260	1852	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	30
PID 1852 wrote to memory of 2260	1852	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	30
PID 1852 wrote to memory of 2260	1852	JaffaCakes118_4dba0b8b53a6226666269bcda873575f.exe	30
PID 2260 wrote to memory of 2336	2260	WScript.exe	31
PID 2260 wrote to memory of 2336	2260	WScript.exe	31
PID 2260 wrote to memory of 2336	2260	WScript.exe	31
PID 2260 wrote to memory of 2336	2260	WScript.exe	31
PID 2336 wrote to memory of 2268	2336	cmd.exe	33
PID 2336 wrote to memory of 2268	2336	cmd.exe	33
PID 2336 wrote to memory of 2268	2336	cmd.exe	33
PID 2336 wrote to memory of 2268	2336	cmd.exe	33
PID 2268 wrote to memory of 1032	2268	SessionHostmonitorNetsavesHost.exe	41
PID 2268 wrote to memory of 1032	2268	SessionHostmonitorNetsavesHost.exe	41
PID 2268 wrote to memory of 1032	2268	SessionHostmonitorNetsavesHost.exe	41
PID 2336 wrote to memory of 1016	2336	cmd.exe	42
PID 2336 wrote to memory of 1016	2336	cmd.exe	42
PID 2336 wrote to memory of 1016	2336	cmd.exe	42
PID 2336 wrote to memory of 1016	2336	cmd.exe	42

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
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1852
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\JEDcOjKcz5t.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\vkBwAxiibpq4vERKhn6zEWt.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2336
  - - C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe
      "C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe"
      4⤵
      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:2268
    - - C:\Windows\System32\C_860\conhost.exe
        
        "C:\Windows\System32\C_860\conhost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1032
  - - 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:1016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\addins\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\normaliz\taskhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\fwcfg\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Documents and Settings\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\C_860\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2028

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\PerfLogs\Admin\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2360

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

JEDcOjKcz5t.vbe

Path C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\JEDcOjKcz5t.vbe
Size 225B
SHA256 e930fcc50609e2bc6697991c9929b0e448c2a1f00334322388ceac4dad198073
MD5 2962f49d50c7a201daa7f3e462dabe16
SHA1 08b5ee7e587d8fb41f47f9968baf4e14140a3bf7
SHA512 31993fe779cffdfad67990b99ba3dde79f1b0bff443a9203d5d392968d106aee95b58cee5aabccb34503428f9f0e8ef1d6456ef3f5ba8458cf3b1dd2848493e7
MD5 SHA1 SHA512

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vkBwAxiibpq4vERKhn6zEWt.bat

Path C:\Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\vkBwAxiibpq4vERKhn6zEWt.bat
Size 177B
SHA256 d0f7b632a8497a14da1da3ee1182e9f69fc3c24d28db709f944fa1121a0fb0a4
MD5 d742136b1fb637ca2ea95803cee64dbf
SHA1 6949f1f2567e7765b018b838b8a656e0f8f7da04
SHA512 38e357d2777de646632d52a3eaca458c7e85202afc041d3df214afe13bb5b731013f2742573ebb406c505bbf73692c037ecc58785ed347a3af618ffd6448e302
MD5 SHA1 SHA512

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SessionHostmonitorNetsavesHost.exe

Path \Users\Admin\AppData\Local\Temp\SessionHostmonitorNet\SessionHostmonitorNetsavesHost.exe
Size 1.1MB
SHA256 ecfdb52196e58db344d66e7ec2e65cb589315dd7bed55bc2a0fe6afe86898433
MD5 d2887b8a1e477a97c84e4b126cb360a3
SHA1 8fb6cdbc31616bd460e703b5bcb77367321c5c8a
SHA512 0691b082aba27120413d99749edd4da34e39488ec3da3e325c93dd36a64b725e7d1623b62b87f4a1b064ee42c2c60e05f0d6d0f7520e81b8b7753820446a667b
SSDEEP 12288:s4tUwqOjgrbMHiYVNtdE50qoc+vFqa/out/vsQJktVXN/JEqII1ZpvxIBGLEqqn4:zGfgcsVTdE507cQtHpq/KKvxUGLF+4
MD5 SHA1 SHA512 SSDEEP

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memory/1032-32-0x0000000000290000-0x00000000003B4000-memory.dmp

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memory/1032-33-0x00000000004F0000-0x00000000004FC000-memory.dmp

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memory/1032-34-0x0000000000500000-0x000000000050C000-memory.dmp

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memory/1032-35-0x0000000000530000-0x000000000053C000-memory.dmp

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memory/1032-36-0x0000000000660000-0x000000000066C000-memory.dmp

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memory/1032-38-0x00000000006A0000-0x00000000006AA000-memory.dmp

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memory/1032-37-0x0000000000690000-0x0000000000698000-memory.dmp

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memory/2268-13-0x0000000000F20000-0x0000000001044000-memory.dmp

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