dcrat | 250196616e509add44f0e1dec8e4e1b515ef52df9a6e3f569ee0fe7c80a13914

General

Target

c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe
Size

1.4MB
MD5

c697f3001198246fe1a1d2494a0ff2ee
SHA1

0505a546298ff2a17d510387a1060ab3f44112e7
SHA256

250196616e509add44f0e1dec8e4e1b515ef52df9a6e3f569ee0fe7c80a13914
SHA512

24b7723c24a8687ad152dacad7b0ea52dc8500c1f6a727eb26d4f8015ef91f56d3e8d1cc5d3d0f11ac9101934ccb814d620f0806941f22c809dbad6dee4cb042
SSDEEP

24576:u2G/nvxW3WieCjbsHd2vNn2LRLpapqDTmRf9KrFnbkW9zdAZeSGhl6C+4Q:ubA3jnvNn2LIqH4S/g9GhwVt

Score

10^/10

dcrat discovery evasion infostealer persistence rat

Malware Config

Signatures

DcRat 5 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		c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe
		3840	schtasks.exe
		3056	schtasks.exe
		3372	schtasks.exe
		2588	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 4 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	3840	5064	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3056	5064	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3372	5064	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2588	5064	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b97-10.dat	dcrat
behavioral2/memory/4160-13-0x0000000000750000-0x000000000087A000-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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	fontCrtmonitordhcpcommonsvc.exe

Executes dropped EXE 2 IoCs

pid	Process
4160	fontCrtmonitordhcpcommonsvc.exe
1468	Registry.exe

Adds Run key to start application 2 TTPs 4 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\fontdrvhost = "\"C:\\Windows\\System32\\oemlicense\\fontdrvhost.exe\""	fontCrtmonitordhcpcommonsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Program Files\\Google\\Chrome\\Application\\SetupMetrics\\RuntimeBroker.exe\""	fontCrtmonitordhcpcommonsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Program Files\\Mozilla Firefox\\defaults\\pref\\fontdrvhost.exe\""	fontCrtmonitordhcpcommonsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Documents and Settings\\Registry.exe\""	fontCrtmonitordhcpcommonsvc.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\System32\oemlicense\fontdrvhost.exe	fontCrtmonitordhcpcommonsvc.exe
File created	C:\Windows\System32\oemlicense\5b884080fd4f94e2695da25c503f9e33b9605b83	fontCrtmonitordhcpcommonsvc.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\Mozilla Firefox\defaults\pref\fontdrvhost.exe	fontCrtmonitordhcpcommonsvc.exe
File opened for modification	C:\Program Files\Mozilla Firefox\defaults\pref\fontdrvhost.exe	fontCrtmonitordhcpcommonsvc.exe
File created	C:\Program Files\Mozilla Firefox\defaults\pref\5b884080fd4f94e2695da25c503f9e33b9605b83	fontCrtmonitordhcpcommonsvc.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	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.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-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
3956	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3372	schtasks.exe
2588	schtasks.exe
3840	schtasks.exe
3056	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4160	fontCrtmonitordhcpcommonsvc.exe
1468	Registry.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4160	fontCrtmonitordhcpcommonsvc.exe
Token: SeDebugPrivilege	1468	Registry.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 3692 wrote to memory of 2216	3692	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe	82
PID 3692 wrote to memory of 2216	3692	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe	82
PID 3692 wrote to memory of 2216	3692	c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe	82
PID 2216 wrote to memory of 3848	2216	WScript.exe	83
PID 2216 wrote to memory of 3848	2216	WScript.exe	83
PID 2216 wrote to memory of 3848	2216	WScript.exe	83
PID 3848 wrote to memory of 4160	3848	cmd.exe	85
PID 3848 wrote to memory of 4160	3848	cmd.exe	85
PID 4160 wrote to memory of 1468	4160	fontCrtmonitordhcpcommonsvc.exe	91
PID 4160 wrote to memory of 1468	4160	fontCrtmonitordhcpcommonsvc.exe	91
PID 3848 wrote to memory of 3956	3848	cmd.exe	92
PID 3848 wrote to memory of 3956	3848	cmd.exe	92
PID 3848 wrote to memory of 3956	3848	cmd.exe	92

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\c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\c697f3001198246fe1a1d2494a0ff2ee_JaffaCakes118.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3692
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\fontCrtmonitor\nA8GErCea25MZivjqg2s92X.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\fontCrtmonitor\l0noRYfNtuMwZAdFzsP7Iup4EtFybJ.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3848
  - - C:\fontCrtmonitor\fontCrtmonitordhcpcommonsvc.exe
      "C:\fontCrtmonitor\fontCrtmonitordhcpcommonsvc.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
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:4160
    - - C:\Documents and Settings\Registry.exe
        
        "C:\Documents and Settings\Registry.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1468
  - - 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:3956

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\defaults\pref\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3840

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:3056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\oemlicense\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\SetupMetrics\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2588

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

Loading Replay Monitor...

Downloads

C:\fontCrtmonitor\fontCrtmonitordhcpcommonsvc.exe

Filesize
1.1MB

MD5
28886e53db2a45715e41eae56995d6f1

SHA1
bc4e39e76862b679008cf09d5f1dfb699f3c2221

SHA256
3016236a2f8762247bcfc3155c3dea0f7e95dd4a169d992f8b513ceb854b3fd6

SHA512
ee054887be745a247f9686552b685859a0f4bf5d1596242796a6ae4e8a34797f98fb3334ef04d59d4d8e2bab90292861d305984f90b161206efbf358c4bbc10f

Download Submit
C:\fontCrtmonitor\l0noRYfNtuMwZAdFzsP7Iup4EtFybJ.bat

Filesize
163B

MD5
1cf2705e98452a852a6de7b249a90c87

SHA1
a471792f55ade29290eec36a725b1220e15146ba

SHA256
8bafb2cdfc3b8cf0118bd973185e077ba2626b37a2f64c9c79e5a7bf2073bc18

SHA512
115813a1766dcbdfc6e690e2f242a0e0ea7d8e801e115e64fc51145c4f56aa12d06a2cb431f74851e0182299ada3de615c2fc64462aecb2ba998cbd2775e2a01

Download Submit
C:\fontCrtmonitor\nA8GErCea25MZivjqg2s92X.vbe

Filesize
221B

MD5
6ffd9e92b08389f74f46cbfa8aaabddf

SHA1
8c941128ea70205935f21ddc70b8246d1787675c

SHA256
1ea84b3dbb654661f188f40ee3ca42d977bc1dab091fc1232a2ce012f368d62e

SHA512
7a384774985905b82964a5f61e12f2d4780d15bbc2b847a987e833c69569fc443e850c2f41e5e89f2bf3bfe2c8de8ad8ed4001b431f975a8755ebd3b83adda79

Download Submit
memory/1468-34-0x000000001BE30000-0x000000001BF32000-memory.dmp

Filesize
1.0MB

Download
memory/1468-39-0x000000001BE30000-0x000000001BF32000-memory.dmp

Filesize
1.0MB

Download
memory/4160-12-0x00007FF868113000-0x00007FF868115000-memory.dmp

Filesize
8KB

Download
memory/4160-13-0x0000000000750000-0x000000000087A000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads