Office (OLE) malware analysis — malicious · 20397e39e9f97462

MALICIOUS

Office (OLE)

167.8 KB Created: 2020-09-14 13:44:00 Authoring application: Microsoft Office Word

MD5: 78b25af1c218fb8968ccd6b23b1f9c78 SHA-1: 7d95f19e45275adfce9ca8adfeaef5eeb3d17557 SHA-256: 20397e39e9f97462e5b9dc1f2132c1f9448b80a57fe3f87e27c2a852585d618b

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV and exhibits critical heuristic firings for VBA macros, specifically a Document_Open auto-exec macro that uses CreateObject. This indicates the macro is designed to run automatically upon opening the document. The presence of the 'macros.bas' artifact further supports the macro-based execution. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the generic downloader detection.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9759988-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9759988-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f8f05dcf3e3edc2b86aaf635a586a86b3be75873e300dc406d21a4e9dd6169c2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22670 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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