Trojan.PS1.KILLAV.C

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

• %User Temp%\{random alphanumeric}.{random alphanumeric}.ps1 → deleted afterwards
• %User Temp%\{random alphanumeric}.{random alphanumeric}.psm1 → deleted afterwards
• %ProgramData%\loader.exe → only if the network share is accessible

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

It adds the following processes:

• Set-MPPreference -DisableTamperProtection $true
• Set-MPPreference -DisableBehaviorMonitoring $true
• Set-MpPreference -MAPSReporting Disabled
• Set-MpPreference -DisableIOAVProtection $true
• Set-MpPreference -EnableNetworkProtection Disabled
• Set-MpPreference -MAPSReporting 0
• Set-MpPreference -MAPSReporting Disabled
• Set-MpPreference -SubmitSamplesConsent NeverSend
• Add-MpPreference -ExclusionProcess {C:\ProgramData\}
• MpCmdRun.exe -RemoveDefinitions -All → removes Windows Defender definitions

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Other Details

This Trojan does the following:

• It checks if the computer name of the host matches the following:
  • K-DYNABOOK01
  • K-DYNABOOK13
  • K-DYNBK017
  • K-DYNBK034
  • K-DYNBK044
  • K-DYNBK058
  • K-HPDISK003
  • K-HPDISK004
  • K-HPDISK007
  • K-HPDISK008
  • K-HPDISK009
  • K-HPDISK010
  • K-HPDISK012
  • K-HPDISK015
  • K-HPPDK001
  • K-HPPDK002
  • K-HPPDK003
  • K-HPPRODSK01
  • K-HPPRODSK03
  • K-LATITUDE14
  • K-LATITUDE19
  • K-NAS01
  • K-OPTIPLEX011
  • K-OPTIPLEX012
  • K-OPTIPLEX013
  • K-OPTIPLEX03
  • K-OPTIPLEX090
  • K-OPTIPLEX10
  • K-OPTIPLEX11
  • K-OPTIPLEX13
  • K-OPTIPLEX19
  • K-OPTIPLEX24
  • K-OPTIPLEX26
  • K-OPTIPLEX27
  • K-OPTIPLEX31
  • K-OPTIPLEX49
  • K-OPTIPLEX90B
  • K-OPTIPLEX91
  • K-OPTIPLEX91B
  • K-PANACFSX01
  • k-server01
  • k-server03
  • K-SERVER04
  • K-SERVER05
  • K-SERVER06
  • K-SERVER17
  • SM-SERVER07
  • Z-oracle01
  • Z-oracle02
• If the computer name matches the allowed host, it will try to copy a file from the following network share:
  • \\{BLOCKED}m.local\SYSVOL\fpc2_dom.local\Policies → inaccessible