Valyria — Office (OOXML) / .DOCM malware analysis

Static analysis result for SHA-256 ec889256894e0feb…

MALICIOUS

Office (OOXML) / .DOCM

82.3 KB Created: 2021-01-29 13:13:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1a38d56549166a9c6d9410725f408f16 SHA-1: 97b5daffd0953f1c90f910d6d02b858c302182d0 SHA-256: ec889256894e0feb6ed386ae5c414149c62b29f3c4a2e2a1a3411c0a982984e0
260 Risk Score

Malware Insights

Valyria · confidence 95%

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

This DOCM file contains VBA macros that are detected by ClamAV as 'Doc.Downloader.Valyria-10033915-0'. The presence of CreateObject and CallByName calls within the VBA code indicates that the macros are designed to execute arbitrary code. The primary function of the embedded VBA script is to download and execute a second-stage payload, as suggested by the 'downloader' classification and the heuristic firings.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-10033915-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-10033915-0
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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
e176e53052bc14c890e0b31b00ab4add4df56e2d3fc16d14fa0432a49f9d6bbd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6839 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
1b0902f431bf2cf7d3cc02bc5ca84193d5fb25f18dc4cd973c530b08a3c8f64d		 vba-project OOXML VBA project: word/vbaProject.bin 50688 bytes
Detection
ClamAV: Doc.Downloader.Valyria-10033915-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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