Win.Dropper.Agent-10045433-0 Office (OOXML) / .DOC malware analysis — malicious · b7d625679fbcc865

MALICIOUS

Office (OOXML) / .DOC

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

MD5: d90aeea054ae8cfbd6fca2bd1588a852 SHA-1: 1bfcb157677167c4d5498a0821f3d40691f1e137 SHA-256: b7d625679fbcc86510119920ffdd6d21005427bf49c015697c69ae1ee27e6bab

260 Risk Score

Malware Insights

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

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening the document. Heuristics indicate the presence of a dropper, and ClamAV signatures confirm this, identifying it as Win.Dropper.Agent-10045433-0. The macro likely downloads and executes a secondary payload, as suggested by the dropper classification and the presence of extracted artifacts.

Heuristics 7

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
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
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` `398f04e8100a52d93d10ce4ccd74dbe6a3a627f5ed052ce0df18212790fd1c4a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7947 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `0324f23cbca0f9ff64798316eeb8c41005113480cf4d50a348d0bcb16730a759`	vba-project	OOXML VBA project: word/vbaProject.bin	681472 bytes
Detection ClamAV: Win.Dropper.Agent-10045433-0 Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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