Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f7e7028eb305ce3c…

MALICIOUS

Office (OLE)

100.6 KB Created: 2011-11-09 01:18:21 Authoring application: Microsoft Excel First seen: 2012-07-06
MD5: a87d131feb68c29689c54f00979f9b23 SHA-1: ded40ebf8f143f021ceeb2da7e754e1e9c7fe1a7 SHA-256: f7e7028eb305ce3c835ad05c88bf680238f9457cd4a5d836c622b65540c1e5ba
222 Risk Score

Heuristics 5

  • Excel Index Array exploit — CVE-2008-3005 critical CVE likely CVE_2008_3005
    Legacy Excel workbook has the CVE-2008-3005 exploit shape: a compact BIFF8 FORMAT-index cluster paired with a normal XF table and a large unallocated OLE slack region used to stage the payload. The FORMAT pattern alone is not sufficient, so the rule requires the OLE slack payload-hiding context to keep false positives low.
  • ClamAV: Xls.Dropper.Agent-7623285-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7623285-0
  • Embedded Adobe Flash (SWF) in OLE document critical OFFICE_EMBEDDED_SWF
    Document contains an embedded Adobe Flash (SWF) object. Vulnerabilities such as CVE-2018-4878 and CVE-2018-15982 involved Flash objects embedded in Office files. Adobe Flash has been end-of-life since December 2020.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 102,992 bytes but its declared streams total only 51,405 bytes — 51,587 bytes (50%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • VBA project contains no executable statements info OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 987 bytes
SHA-256: 844195afee34ef466a9f1be5be410855e42b26515e558a64450a0483ba518df3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "ShockwaveFlash1, 2, 0, ShockwaveFlashObjects, ShockwaveFlash"

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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