Resubmissions

15/11/2022, 16:21

221115-ttqadsef86 8

23/10/2022, 08:47

221023-kp8fqshecq 8

07/09/2022, 08:40

220907-kk3ppagffk 8

23/08/2022, 12:29

220823-pnxeasefbj 8

19/07/2022, 06:41

220719-hfzfcsedal 8

01/07/2022, 12:35

220701-psrdvadeck 8

01/07/2022, 07:51

220701-jp55yaafdn 8

General

  • Target

    avast_secure_browser_setup_beta.exe

  • Size

    5.8MB

  • Sample

    220701-jp55yaafdn

  • MD5

    94cad7d26b9562c8380e35b32f63dce8

  • SHA1

    7102c8cdef2130f3cb6b33f06e55f4ea974c9fca

  • SHA256

    bb52c8ba0a223cfe2a007462efcca89d29cedd1ff1a1b03e7db6c8e464cc6797

  • SHA512

    396c4d250a37da7a792332e2f25d4719318db54f896c6bf4b1d3f20c06b3ffc69e7ec16740b7d48a677f572c1fa8c6f57ddaa411fd8c97982e6d2842d2be458c

Malware Config

Targets

    • Target

      avast_secure_browser_setup_beta.exe

    • Size

      5.8MB

    • MD5

      94cad7d26b9562c8380e35b32f63dce8

    • SHA1

      7102c8cdef2130f3cb6b33f06e55f4ea974c9fca

    • SHA256

      bb52c8ba0a223cfe2a007462efcca89d29cedd1ff1a1b03e7db6c8e464cc6797

    • SHA512

      396c4d250a37da7a792332e2f25d4719318db54f896c6bf4b1d3f20c06b3ffc69e7ec16740b7d48a677f572c1fa8c6f57ddaa411fd8c97982e6d2842d2be458c

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Modifies Installed Components in the registry

    • Registers COM server for autorun

    • Sets file execution options in registry

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • 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.

MITRE ATT&CK Enterprise v6

Tasks