Office (OLE) / .DOCX malware analysis — malicious · 5d0da887ed070060

MALICIOUS

Office (OLE) / .DOCX

170.8 KB Created: 2021-01-05 12:07:00 Authoring application: Microsoft Office Word

MD5: d80d23974743f7f85596611ccf3a5ddd SHA-1: 3471f7d6527f6e39e5a4b617ce99f270b3903ebb SHA-256: 5d0da887ed070060c78e25140cd25c95645a139a31d8792e981833b42204f99d

262 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a heavily obfuscated VBA macro with a Document_Open auto-execution routine. This macro utilizes CreateObject to interact with the file system, creating files with suspicious names and content in temporary directories. The ClamAV detection and heuristic firings strongly suggest this is a downloader for a second-stage payload, consistent with Emotet family behavior, though specific attribution is not possible.

Heuristics 7

Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
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.
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` `5fd199a84582bf2c4248191e49df05fe3a9d17ab4a6f639ead9a581ea6be129f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	10799 bytes

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