Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 57c248e2b2943aca…

MALICIOUS

Office (OOXML) / .DOC

41.3 KB Created: 2020-10-07 08:48:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 87d72a231677a812a80be1dffaea8a6e SHA-1: 74e528c44b5ca1377ce86beb9bebb28fff675d48 SHA-256: 57c248e2b2943aca0f672bd585cf3f959151973643bd0a04aebd35b87724dadb
220 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.Sagent-9770108-0. Static analysis revealed the presence of VBA macros, specifically a Document_Open macro and a GetObject call, indicating an attempt to execute malicious code upon opening. The primary function of the embedded VBA macros is to download and execute a second-stage payload, as suggested by the ClamAV detection name.

Heuristics 6

  • ClamAV: Doc.Downloader.Sagent-9770108-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sagent-9770108-0
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2016/wordml/cid
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fbaf63a64e41bb25131406d953d4912444a7e38c6b26918b2455c46d1b264140		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3135 bytes
vbaProject_00.bin
320dd5546f320ba1f9e3fe2c290c072d8760570fd54121254c1e02a4a99ace87		 vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
Detection
ClamAV: Doc.Downloader.Sagent-9770108-0
Obfuscation or payload: unlikely
emf_00.emf
b2ab9d395a50006236f6322cc59e98b6f37bcfa1a82c1b2dfb51c88f3c0c8f88		 ooxml-emf OOXML EMF part: word/media/image1.emf 31176 bytes

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