Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e623aa9562f0f5b6…

MALICIOUS

Office (OOXML)

55.3 KB Created: 2021-01-31 23:09:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: fbdee83dbd4af1e15a03321fc83ad7a4 SHA-1: 2b4114cf8da839813fc86ec9a71cb0f982287165 SHA-256: e623aa9562f0f5b69578345516119704a987277aab69602429645b4c7ef410de
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The AutoOpen macro triggers the execution of a PowerShell command via the Shell() function. This command downloads a second-stage executable from 'http://apo.palen.club:2095/reps/bf24.exe' and saves it as '%TEMP%\tgh.exe', which is then executed. This indicates a downloader or dropper functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Dropper.Generic-9823774-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Generic-9823774-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Suspicious extracted artifact info 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.
  • 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.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/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
3229d3d2913162689e7c68e2c147acff6f9dc5f659a7e6221072a4c33a0dda93		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1425 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
f84c2b507d5ff7c14bc1f5c7e81bbe2e9848b3b2f2e4d30e60e5abb09132fc6c		 vba-project OOXML VBA project: word/vbaProject.bin 10752 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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