Office (OLE) / .DOCX malware analysis — malicious · 18b45f75f68019c7

MALICIOUS

Office (OLE) / .DOCX

576.0 KB Created: 2021-08-20 16:58:00 Authoring application: Microsoft Office Word

MD5: 28272069c90ed677f9ff4ff2370ab8b6 SHA-1: 579dd838af0a55e379bd5851762cb69409f6c8cf SHA-256: 18b45f75f68019c7e36311d9f62cea57b861ea576a478be6b11ee26d30c32c16

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing VBA macros. The macros reference WinExec and Windows Script Host, indicating an attempt to execute arbitrary commands. Specifically, the Auto_Close macro is configured to execute code upon closing the document, likely to download and run a second-stage payload.

Heuristics 6

Reference to WinExec API high SC_STR_WINEXEC

Reference to WinExec API
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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.
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` `36490a707dd24c0bec63fec758f052f6ba0c68ba9bff446cc1f8b050c8e1cb8a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5583 bytes

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