Office (OOXML) / .DOC malware analysis — malicious · 3b01fe638eac5dce

MALICIOUS

Office (OOXML) / .DOC

73.3 KB Created: 2017-05-11 20:48:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: 90847162fde2e8b47b41501e96a35815 SHA-1: 8cddf1f61e0670c1394d57eef4e199bbbda6325c SHA-256: 3b01fe638eac5dcee60750424fd0f72a310f16559c54206aeffa632a7c6b31b0

382 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, including an AutoOpen and Document_Open subroutine, which are commonly used to initiate malicious actions upon document opening. The script attempts to create objects and uses CallByName, indicating dynamic execution of code. The embedded URL fragments suggest the macro is designed to download and execute a second-stage payload from a remote server. The ClamAV detection 'Doc.Downloader.Donoff-10030369-0' further supports its role as a downloader.

Heuristics 10

ClamAV: Doc.Downloader.Donoff-10030369-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Donoff-10030369-0
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
GetObject call high OLE_VBA_GETOBJ

GetObject call
CallByName call high OLE_VBA_CALLBYNAME

CallByName 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.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` `a5dc25dbfab11049ee1aa7242100838bf4982196310a1413a2148d226d278a45`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12150 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` `507b6593ab2ef1153b5cea59f1676896fbc6a3773207bd35a74118b273e2e933`	vba-project	OOXML VBA project: word/vbaProject.bin	44032 bytes
Detection ClamAV: Doc.Downloader.Donoff-10030369-0 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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