551991bf13566c90b1f407dcc33e94ef2bcee8b809eecc073ea9e5a67fb9a954

General

Target

ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe
Size

61KB
MD5

ea9249be6ee517c229996e9655186bcd
SHA1

c779c0bcd4318c7c06a2ea86c3ef4df88dc566da
SHA256

551991bf13566c90b1f407dcc33e94ef2bcee8b809eecc073ea9e5a67fb9a954
SHA512

5c0143e3d2fc8d725a67560d0c3b4afce27d94509a03d35f2409863d79916ea1346c4f24ef97c519ceecd284bb5ed8647910bf30a10a8bdba0f7e1e2b5fedb28
SSDEEP

1536:tcrxO0Y4XVYwfrDjiALxMZxr8zWkFewhef:SxOMXVL7i/j2WkFemy

Score

10^/10

discovery evasion persistence trojan

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "Explorer.exe %WINDIR%\\system\\crssc.exe"	crssc.exe

Modifies security service 2 TTPs 1 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4"	crssc.exe

Windows security bypass 2 TTPs 5 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	crssc.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	crssc.exe

Disables Task Manager via registry modification
evasion

Deletes itself 1 IoCs

pid	Process
2888	crssc.exe

Executes dropped EXE 1 IoCs

pid	Process
2888	crssc.exe

Windows security modification 2 TTPs 5 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	crssc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	crssc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\crssc.exe = "C:\\Windows\\system32\\crssc.exe"	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe

Drops file in System32 directory 11 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\microsoft\backup.ftp	crssc.exe
File created	C:\Windows\SysWOW64\crssc.exe	crssc.exe
File opened for modification	C:\Windows\SysWOW64\ftp.exe	crssc.exe
File opened for modification	C:\Windows\SysWOW64\tftp.exe	crssc.exe
File opened for modification	C:\Windows\SysWOW64\dllcache\tftp.exe	crssc.exe
File opened for modification	C:\Windows\SysWOW64\microsoft\backup.tftp	crssc.exe
File created	C:\Windows\SysWOW64\microsoft\backup.ftp	crssc.exe
File created	C:\Windows\SysWOW64\crssc.exe	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\crssc.exe	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\crssc.exe	crssc.exe
File opened for modification	C:\Windows\SysWOW64\dllcache\ftp.exe	crssc.exe

System Location Discovery: System Language Discovery 1 TTPs 2 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	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	crssc.exe

Modifies data under HKEY_USERS 8 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies	crssc.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr = "1"	crssc.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\System	crssc.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2888	crssc.exe
2888	crssc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	crssc.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 5104 wrote to memory of 2888	5104	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe	82
PID 5104 wrote to memory of 2888	5104	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe	82
PID 5104 wrote to memory of 2888	5104	ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe	82

C:\Users\Admin\AppData\Local\Temp\ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\ea9249be6ee517c229996e9655186bcd_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5104
- C:\Windows\SysWOW64\crssc.exe
  "C:\Windows\system32\crssc.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Modifies security service
  - Windows security bypass
  - Disables RegEdit via registry modification
  - Deletes itself
  - Executes dropped EXE
  - Windows security modification
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2888

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

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:\Windows\SysWOW64\crssc.exe

Filesize
61KB

MD5
ea9249be6ee517c229996e9655186bcd

SHA1
c779c0bcd4318c7c06a2ea86c3ef4df88dc566da

SHA256
551991bf13566c90b1f407dcc33e94ef2bcee8b809eecc073ea9e5a67fb9a954

SHA512
5c0143e3d2fc8d725a67560d0c3b4afce27d94509a03d35f2409863d79916ea1346c4f24ef97c519ceecd284bb5ed8647910bf30a10a8bdba0f7e1e2b5fedb28

Download Submit
memory/2888-14-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-35-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-33-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-30-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-26-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-23-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-21-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-17-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/2888-16-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-6-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-19-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-20-0x0000000000401000-0x0000000000498000-memory.dmp

Filesize
604KB

Download
memory/5104-3-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-5-0x0000000000401000-0x0000000000498000-memory.dmp

Filesize
604KB

Download
memory/5104-0-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-7-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download
memory/5104-1-0x0000000000600000-0x0000000000602000-memory.dmp

Filesize
8KB

Download
memory/5104-2-0x0000000000400000-0x0000000000499000-memory.dmp

Filesize
612KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads