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

Static analysis result for SHA-256 2cd5f1852ac6d3ed…

MALICIOUS

Office (OOXML) / .DOCX

81.1 KB Created: 2020-02-26 08:04:00 UTC Authoring application: Microsoft Office Word 15.0000
MD5: a9dac36efd7c99dc5ef8e1bf24c2d747 SHA-1: cbb8985404281455bbcf02354060fb1e7576d4c2 SHA-256: 2cd5f1852ac6d3ed481394ea0abc49f16789c12fb81bcdf9988762730fb0aa8f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing VBA macros, specifically an AutoOpen macro, which is a common technique for initial execution. The ClamAV heuristic identifies it as 'Doc.Dropper.Agent-7601883-0', indicating it's a dropper. The presence of CreateObject calls further suggests the execution of arbitrary code, likely to download and execute a secondary payload. The document body content is unrelated to the malicious functionality.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-7601883-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7601883-0
  • 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.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/2012/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
ca675734b6f405a0d2cc25fe983a8a4f46fd97cb9b67a584ca7bde3f40ed2c2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1263 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
373fda643cb5ed82cff06df1e941e58692320b87b64b100d36bd75f0c54a0935		 vba-project OOXML VBA project: word/vbaProject.bin 10752 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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