General

  • Target

    OInstall.exe

  • Size

    18.0MB

  • Sample

    240827-jlj4aszdpf

  • MD5

    816ed6fdf32a6d2ae153be18ebca59e7

  • SHA1

    21264678ebd5c879f269ec60564b653dc1052ef4

  • SHA256

    19b021d9bcf3b0137f2847a3e08826dbc52e88ffe617579b325f14068954db3f

  • SHA512

    a6579f7fad6fdf59855cdba998764474bf408f441a924ec3c1cd1d1e51ac53a72fdbad75dc44bb06659a5fcb12ec239dc9f43cf32fd6ffe9523e57c5f9e6cf18

  • SSDEEP

    393216:+CqFTywoCkhfO/zFXGW/F/P9wXiXzTheCeC/+pWt0Ts:+XFTXRkdObGXYzteWMa0o

Malware Config

Extracted

Language
ps1
Deobfuscated
URLs
exe.dropper

https://mrodevicemgr.officeapps.live.com/mrodevicemgrsvc/api/v2/C2RReleaseData

Extracted

Language
ps1
Deobfuscated
URLs
exe.dropper

http://officecdn.microsoft.com/pr/5030841d-c919-4594-8d2d-84ae4f96e58e/Office/Data/16.0.14332.20763/i640.cab

Extracted

Language
ps1
Deobfuscated
URLs
exe.dropper

http://officecdn.microsoft.com/pr/5030841d-c919-4594-8d2d-84ae4f96e58e/Office/Data/16.0.14332.20763/i641033.cab

Targets

    • Target

      OInstall.exe

    • Size

      18.0MB

    • MD5

      816ed6fdf32a6d2ae153be18ebca59e7

    • SHA1

      21264678ebd5c879f269ec60564b653dc1052ef4

    • SHA256

      19b021d9bcf3b0137f2847a3e08826dbc52e88ffe617579b325f14068954db3f

    • SHA512

      a6579f7fad6fdf59855cdba998764474bf408f441a924ec3c1cd1d1e51ac53a72fdbad75dc44bb06659a5fcb12ec239dc9f43cf32fd6ffe9523e57c5f9e6cf18

    • SSDEEP

      393216:+CqFTywoCkhfO/zFXGW/F/P9wXiXzTheCeC/+pWt0Ts:+XFTXRkdObGXYzteWMa0o

    • Blocklisted process makes network request

    • Event Triggered Execution: Image File Execution Options Injection

    • Manipulates Digital Signatures

      Attackers can apply techniques such as changing the registry keys of authenticode & Cryptography to obtain their binary as valid.

    • Stops running service(s)

    • Suspicious Office macro

      Office document equipped with 4.0 macros.

    • Checks computer location settings

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

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • Executes dropped EXE

    • Loads dropped DLL

    • Checks installed software on the system

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

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Indicator Removal: Clear Persistence

      remove IFEO.

    • Installs/modifies Browser Helper Object

      BHOs are DLL modules which act as plugins for Internet Explorer.

    • Checks system information in the registry

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

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks