Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f0e6ec9776bdce6d…

MALICIOUS

Office (OOXML)

18.1 KB Created: 2021-07-07 12:47:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 85f5ed34eb720fde82cdf83d3194695f SHA-1: 1352f07a7027e0f38422afd645697f3b0d5d3c5c SHA-256: f0e6ec9776bdce6ddfc3d6bd18384fcaa6fdfe5a49a60e450c05917495d9276b
522 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious Macro T1137.005 Software Deployment Tools: Macro

The sample contains VBA macros that automatically execute upon opening the document via the Document_Open and AutoOpen subroutines. These macros utilize WScript.Shell to execute a PowerShell command. The PowerShell command downloads and executes a script from the URL http://192.168.178.130/rsh.ps1, indicating a downloader or second-stage payload delivery mechanism.

Heuristics 12

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6152d59ca4fab3149766b446bd1e01b37818361aae82c735f4dfc51c976b98af		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 927 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
c40fbbe91b89c89af22f2c910b91436ab32c32c742758ad57a179a1801a76dad		 vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: likely
Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).

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