Win.Dropper.Agent-10045433-0 Office (OOXML) / .DOC malware analysis — malicious · 14213c013d79ea4b

MALICIOUS

Office (OOXML) / .DOC

323.1 KB Created: 2020-04-13 18:42:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: e4541d91fca9df943b6e119dc1c6cd7f SHA-1: a0e0a94417e9c594c5c68a6c815160c8b6a980ae SHA-256: 14213c013d79ea4bc8309f730e26d52ff23c10654197b8d2d10c82bbbcd88382

264 Risk Score

Malware Insights

Win.Dropper.Agent-10045433-0 · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV with the signature Win.Dropper.Agent-10045433-0. Static analysis revealed the presence of VBA macros, specifically an AutoOpen macro that utilizes CreateObject, indicating an attempt to execute code. The VBA script's functionality, though truncated, suggests it is designed to download and execute a secondary payload, a common dropper behavior.

Heuristics 8

ClamAV: Win.Dropper.Agent-10045433-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.Agent-10045433-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen 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 project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present
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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
- http://schemas.microsoft.com/office/drawing/2014/chartex
- http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
- 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/2012/wordml
- http://schemas.microsoft.com/office/word/2015/wordml/symex
- 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` `4337ef62f40747e0e46eea651b4674b672d737b2681aa6cee98a2ae802aa57f2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7965 bytes
`vbaProject_00.bin` `8041a4a74317656bbcab414bb1b72de1ad812cd84c4d80e5da05578f475ef206`	vba-project	OOXML VBA project: word/vbaProject.bin	678912 bytes
Detection ClamAV: Win.Dropper.Agent-10045433-0 Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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