General

  • Target

    avast_free_antivirus_setup_online.exe

  • Size

    256KB

  • Sample

    230328-xyk31sed5x

  • MD5

    a414f93155ac391c810341d7d63503d1

  • SHA1

    1d810c4b6c7857fa8573b89f0b256ec30cd7fff2

  • SHA256

    cf8993155ec93296a928cafb33395397d627f9693edbf6fbaf0c23df4ad56049

  • SHA512

    e6b993e743db13c415583b73790db4799b8bc98d13f28218efccccc1d793548055c8cc58a8595a2376315a9665b576e14c580ae21f6c22d388e161b684d04433

  • SSDEEP

    6144:GCfHrZae3GFqRQcMeh4WpywpjchNCP7+eb:GCfLZadcM24fRNte

Malware Config

Targets

    • Target

      avast_free_antivirus_setup_online.exe

    • Size

      256KB

    • MD5

      a414f93155ac391c810341d7d63503d1

    • SHA1

      1d810c4b6c7857fa8573b89f0b256ec30cd7fff2

    • SHA256

      cf8993155ec93296a928cafb33395397d627f9693edbf6fbaf0c23df4ad56049

    • SHA512

      e6b993e743db13c415583b73790db4799b8bc98d13f28218efccccc1d793548055c8cc58a8595a2376315a9665b576e14c580ae21f6c22d388e161b684d04433

    • SSDEEP

      6144:GCfHrZae3GFqRQcMeh4WpywpjchNCP7+eb:GCfLZadcM24fRNte

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Sets service image path in registry

    • Executes dropped EXE

    • Loads dropped DLL

    • Registers COM server for autorun

    • Adds Run key to start application

    • Checks for any installed AV software in registry

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Drops file in System32 directory

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

3
T1060

Bootkit

1
T1067

Defense Evasion

Modify Registry

3
T1112

Discovery

Security Software Discovery

1
T1063

Query Registry

4
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

2
T1082

Tasks