Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 affcbd188ec767d7…

MALICIOUS

Office (OOXML)

179.4 KB Created: 2021-01-13 17:12:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-01-23
MD5: d7fafec7fa7098a314953756c242e11b SHA-1: ed632d64fe0a8f3161540f429c63d7c6ad9d9f0e SHA-256: affcbd188ec767d71908b0e69859b7bdd54e3e2325a4941b637dbb88206af435
62 Risk Score

Heuristics 3

  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 303 bytes
SHA-256: 5a95548bdd5a94267ecf257fa7554d6362c1de66b78c17e4deddb4ee555cc22f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Ëèñò1"
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
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 254464 bytes
SHA-256: f8e8012acf3332c50d16423303b9c0b40d3a77fd02384e9572c8b218f0431de7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
7046 of 11690 identifiers look randomly generated (e.g. 'SDDJNV8wyTVSMMk1yTDJNcQwyTXTMMk13jDJNf0w'); 17 string-concatenation chain(s) — consistent with name-mangling obfuscation. Carved artifact contains 129 long base64-like blob(s).

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