Office (OLE) / .DOCX malware analysis — malicious · 3d76f59c4dceb135

MALICIOUS

Office (OLE) / .DOCX

48.0 KB Created: 2023-02-10 07:03:00 Authoring application: Microsoft Office Word

MD5: e66e96db8080b8042ad5691805ca79ac SHA-1: 22bd61247ada53f582c8897fbef5bb0ddb57cce4 SHA-256: 3d76f59c4dceb13546eb9c72a7c0f03fd335093583d326de9a314f3dbd5a77cc

368 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1071.001 Web Protocols T1059.003 Windows Command Shell

The sample contains VBA macros, including a Document_Open auto-execution macro, which is designed to execute code upon opening the document. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs, suggesting the macro attempts to download and execute a second-stage payload. The document body displays a deceptive message resembling a transaction receipt, likely a lure to encourage users to enable macros.

Heuristics 10

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Doc.Downloader.Bartalex-6755229-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Bartalex-6755229-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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` `02a2e603d7376b26cf6aed4fbad954cb50a9ffe06a0394b1aee29e945ba4fb05`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6730 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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