Office (OLE) malware analysis — malicious · c307a41474269ae0

MALICIOUS

Office (OLE)

153.2 KB Created: 2020-09-14 22:09:00 Authoring application: Microsoft Office Word

MD5: 526c823ea8bf31125276927f6de787e1 SHA-1: e5c2003fb86cc2a33a834e05cf55c211554ccd90 SHA-256: c307a41474269ae0b2b8ef107def0069342bf85eb73c27d4a9aa93a1d074f9ac

240 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Office document containing a critical ClamAV detection and multiple high-severity heuristics indicating the presence of VBA macros. Specifically, the 'Document_Open' macro and 'CreateObject' call, combined with 'VBA p-code auto-exec with execution tokens', strongly suggest that the macros are designed to execute arbitrary code upon opening the document. The extracted 'macros.bas' file is the source of this malicious behavior. The script appears to construct a command string, likely for downloading and executing a second-stage payload, evidenced by the reconstructed string 'W' + '_' + '1' + '' + 'y' + 'e' + 'g' + 'Q' + 'k' + 's' + '1' + '' + 't' + 'l' + 's' + '1' which resolves to 'W_1_yegQks1_tls1'. This behavior aligns with a common malware delivery pattern.

Heuristics 7

ClamAV: Doc.Malware.Generic-9760527-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Generic-9760527-0
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` `bf2dc6e4793502154f28a14458af4f5198ccc48932a5641a4c34f7f1fcdc0c82`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18582 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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