Office (OLE) / .DOC malware analysis — malicious · c4a5fb821fb93eba

MALICIOUS

Office (OLE) / .DOC

118.3 KB Created: 2020-09-08 13:25:00 Authoring application: Microsoft Office Word

MD5: 25b9581711975d95069efdeb22582f7c SHA-1: 0e73fef85008b6352ded52a78bcb4fd597a1bf7b SHA-256: c4a5fb821fb93ebac8bf91a8cb2097c6f920528bc3803bcd26d70e1f1bd9b201

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a malicious OLE document containing VBA macros. The 'Document_Open' macro is automatically executed upon opening the document, which then uses 'CreateObject' to call the Windows command shell. This shell command is obfuscated but appears to be designed to download and execute a second-stage payload. The presence of the 'macros.bas' artifact further confirms the macro-based nature of the attack.

Heuristics 6

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` `b01e45392c986f1d4b51f727387b9ea58fccd144bdd076654b3383bbb58ced48`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12536 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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