Office (OLE) / .DOCX malware analysis — malicious · c79e3e3eb444ac8d

MALICIOUS

Office (OLE) / .DOCX

206.1 KB Created: 2020-10-28 18:42:00 Authoring application: Microsoft Office Word

MD5: 481d81bac8d35d60b0940a4f1ea3d18b SHA-1: 0d75619fd67da8924a6be26fab7e1ea30b789df0 SHA-256: c79e3e3eb444ac8d43384bf99c4cbd5b8ab94eb831bec3bb2eddef59dbe7b9ca

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for initiating malicious actions upon opening the document. The presence of CreateObject calls and the ClamAV detection as 'Doc.Downloader.Generic' strongly suggest that the macros are designed to download and execute a second-stage payload. The extracted 'macros.bas' file is the likely source of this malicious behavior.

Heuristics 7

ClamAV: Doc.Downloader.Generic-9785156-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-9785156-0
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` `e949db65d47346cd391eb9bc49c66a713688cfea31c7cb788a6d1dce1ea9efc6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18584 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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