Office (OOXML) / .DOC malware analysis — malicious · 6e11a0cab8a38ec9

MALICIOUS

Office (OOXML) / .DOC

216.7 KB Created: 2020-05-21 17:33:00 UTC Authoring application: Microsoft Office Word 14.0000

MD5: 9dd09e04b3bfe16b24830a5588af9a1a SHA-1: e1d33c976b9708600761dcb96ba85dc58b9fd8ee SHA-256: 6e11a0cab8a38ec9f9e15c3d62b1fb7cd18149c2bc0f7c8f4f401b01e30c5bb5

272 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample contains a Document_Open macro that is obfuscated and uses GetObject to execute code. The macro attempts to write a DLL file named 'Verkila.dll' to 'C:\WintLog\'. The document body displays a fake invoice from 'T&O Pharmaceutical Network Services', suggesting a phishing or scam attempt. The presence of VBA macros and the obfuscated loader are strong indicators of malicious intent.

Heuristics 9

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.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject 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 project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present
External hyperlinks (2) low OOXML_EXTERNAL_HYPERLINKS

Document contains 2 external hyperlinks — clickable URLs are stored as external relationships. First target: http://topharmaceutical.net/
Suspicious extracted artifact info 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.
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://topharmaceutical.net/
- http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/officeDocument/2006/math
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
- http://schemas.openxmlformats.org/wordprocessingml/2006/main
- http://schemas.microsoft.com/office/word/2010/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
- http://schemas.microsoft.com/office/word/2010/wordprocessingInk
- http://schemas.microsoft.com/office/word/2006/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `33c6e139211f418557c235d9d8786e68c14cd277a4ecf95972e7b07a78b6748b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3704 bytes
`vbaProject_00.bin` `65f5b327a0f72c158b33f93cb55ce94eec63a4df0976436c618d7017834fd0d1`	vba-project	OOXML VBA project: word/vbaProject.bin	21504 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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