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

Static analysis result for SHA-256 35199e044e6a22ec…

MALICIOUS

Office (OOXML) / .DOC

127.9 KB Created: 2020-09-23 10:05:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: d23bbfbc8425918b378b0b4a863892a6 SHA-1: 04d7d3e44f4b7ea579346fbffd2c4feed229e022 SHA-256: 35199e044e6a22ec48a436dcc80d5ce1e3d2d6cc976275545a71a5954c6678cc
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically an AutoOpen macro that utilizes the Shell() function to execute code. ClamAV identified the file as 'Doc.Dropper.Mrdy-9765650-0', indicating it's a dropper. The macro's intent is to download and execute a second-stage payload, as suggested by the dropper classification and the presence of VBA execution techniques. No specific IOCs beyond the ClamAV signature were extracted.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Dropper.Mrdy-9765650-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Mrdy-9765650-0
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
fa8f952a2763889788b7ea7e68aab115c424ccf9295516cdd7bf911bb3b944f5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13198 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
9597bf808789680e1c356d4bfa490df2c10dee285a5757dcea0b8733bf87da8d		 vba-project OOXML VBA project: word/vbaProject.bin 47104 bytes
Detection
ClamAV: Doc.Dropper.Mrdy-9765650-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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