Valyria Office (OLE) / .DOC malware analysis — malicious · 43a6a73b76e865ce

MALICIOUS

Office (OLE) / .DOC

37.5 KB Created: 2021-07-06 04:33:00 Authoring application: Microsoft Office Word

MD5: 12eb065c1e6a84842543f25e2d6a1d33 SHA-1: e15391edfa62e45e9201c2cce4d57e88041c0c3d SHA-256: 43a6a73b76e865ce40f8d61ffd2e961990122c190d7a76af334ddf1182f78137

202 Risk Score

Malware Insights

Valyria · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The sample is a malicious Microsoft Word document detected as 'Doc.Downloader.Valyria-10033997-0' by ClamAV. It contains VBA macros that utilize `CreateObject` and `CallByName` to dynamically execute code. The `send` subroutine within the 'macros.bas' script attempts to POST data to 'https://bigben-soft-down.com/ecm/ibm/1628605443/feedback' and then processes the response, likely to download and execute a second-stage payload. The `Document_Close` subroutine also displays a fake error message and attempts to show the 'frmFeedback' form, further indicating a user-interaction-based lure.

Heuristics 6

ClamAV: Doc.Downloader.Valyria-10033997-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Valyria-10033997-0
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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 https://bigben-soft-down.com/ecm/ibm/1628605443/feedback
- http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `18e58ca9644ad789397b9183a606ed6c65314d90f1948337aade13175b902f8a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2880 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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