Valyria — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 f30b9c09e25075a6…

MALICIOUS

Office (OOXML) / .DOC

866.3 KB Created: 2022-09-26 12:15:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2022-09-26
MD5: 8a43c6076901915775b9bbc1c353dcda SHA-1: fafe67d696bca1ae14da5ad73369b7258264da54 SHA-256: f30b9c09e25075a6b67aa88252440cc0408b1d5ae3335648dc36bc441f3caacf
342 Risk Score

Malware Insights

Valyria · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OOXML document containing an obfuscated auto-exec VBA loader. The VBA macro utilizes `Shell()` and `CreateObject()` calls, indicative of downloading and executing a second-stage payload. ClamAV signatures confirm this behavior, identifying it as 'Xls.Dropper.Valyria-10012499-0'.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Xls.Dropper.Valyria-10012499-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Valyria-10012499-0
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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.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
9f0b41509272438fb33237ea7fee8eae16c6b935887418c36cb1211876cdd391		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 29706 bytes
vbaProject_00.bin
2a5332cb58b9b56b21af4db80493187c163e50875e95f86253ae2dca0fa81ec6		 vba-project OOXML VBA project: word/vbaProject.bin 34304 bytes
Detection
ClamAV: Xls.Dropper.Valyria-10012499-0
Obfuscation or payload: unlikely

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