Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 62a890cce10f128f…

MALICIOUS

Office (OOXML)

18.8 KB Created: 2021-07-23 11:16:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 23f5fcb554e6b8d0a935ce0474ee5a8e SHA-1: 32dcf6abe376bdc88597776373dae6266855368f SHA-256: 62a890cce10f128f180d6e2b848ffff42e32859fe58a023b2bdb35dbe0a1713b
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer T1203 Exploitation for Client Execution

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro saves the document as a template and creates a new document, while 'autonew' uses URLDownloadToFile to download a payload from 'https://kavach.govrn.xyz/shedule.exe' and saves it as 'C:\Users\Public\Adobe.exe'. The 'autoclose' macro then executes this downloaded file. This indicates a downloader/dropper functionality.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Malware.Mrafr-10020543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Mrafr-10020543-0
  • 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
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://kavach.govrn.xyz/shedule.exe
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/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
d126d8f5c2241056bbdb2fe1ef1f22bb5f2dd0a31ace13531724b9215c8024cd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1269 bytes
vbaProject_00.bin
ff150d2fdf93837fe219e14885fe770261442de8bc501473e2b60e11a7fadd40		 vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
Detection
ClamAV: Doc.Malware.Mrafr-10020543-0
Obfuscation or payload: unlikely

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