Valyria Office (OOXML) / .DOCM malware analysis — malicious · a2e480a0509fa13c

MALICIOUS

Office (OOXML) / .DOCM

31.8 KB Created: 2016-07-27 07:54:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: 7301bdeb8b56ee2e017b33dd3867e8cb SHA-1: 8bdac2c0484b84be7ac8a16ea755fbf8857de9e3 SHA-256: a2e480a0509fa13cfa4e1323fd1f39de018938b7f3883fed8822ab22f81bb239

262 Risk Score

Malware Insights

Valyria · confidence 70%

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1566.001 Phishing: Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a .DOCM file containing an AutoOpen macro that calls a function named 'LoadBaseFile'. While the script excerpt is truncated and contains some distracting noise, the ClamAV detection 'Doc.Malware.Valyria' directly attributes the sample to the Valyria family. The presence of CreateObject calls and a long encoded blob noted in the heuristics indicates the intent to download and execute a second-stage payload.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10019999-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10019999-0
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.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` `e0da573dd4bde97489d027cfab72fd1447c59c94d9bf3c71aea105824a161810`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12398 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `027d88424d079817065ee1f4ccbfe6000672cb51b365e1a9e7e9f3a96c857ef3`	vba-project	OOXML VBA project: word/vbaProject.bin	49152 bytes
Detection ClamAV: Doc.Malware.Valyria-10019999-0 Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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