Office (OOXML) / .DOCX malware analysis — malicious · 7b77112ac7cbb719

MALICIOUS

Office (OOXML) / .DOCX

129.6 KB Created: 2019-01-10 09:54:00 UTC Authoring application: Microsoft Office Word 14.0000

MD5: 093ecb712d438ab01b3f07718428dcc7 SHA-1: 89b9b7f2c3eb275eabe78c04a30dc09281a201e6 SHA-256: 7b77112ac7cbb7193bcd891ce48ab2acff35e4f8d523980dff834cb42eaffafa

420 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

This OOXML document contains VBA macros, specifically triggering AutoOpen and Document_Open, which are commonly used for malicious execution. The macros utilize the Shell() function and CreateObject, indicating an attempt to execute arbitrary commands or download further payloads. ClamAV detections confirm the malicious nature, identifying it as a dropper. The presence of these elements strongly suggests the document's purpose is to deliver and execute a secondary stage malware.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
ClamAV: Doc.Dropper.Agent-6839943-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6839943-0
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
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open 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.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` `0f3489d389560388a6ba0b5bcdc50b05886d68f0061884cc7f85ee82d2dfceac`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3999 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `2eb7d3006a8c192594e515a097e3a3a3d179195282d62e1dafb158ce2ff7a49a`	vba-project	OOXML VBA project: word/vbaProject.bin	18432 bytes
Detection ClamAV: Doc.Dropper.Agent-6839943-0 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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