Office (OLE) / .XLSX malware analysis — malicious · 2013496fe5524988

MALICIOUS

Office (OLE) / .XLSX

203.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 34ee9111f987b903bce643f660d2d7ce SHA-1: a7b9d6fa34914921826fc7913e0d3ccd145ebaf2 SHA-256: 2013496fe5524988c28357245d684cdca787b47c0b3b16cae20b3222977d769b

282 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The presence of Workbook_Open, Auto_Open, and Auto_Close macros, along with a critical heuristic for URLDownloadToFile API, strongly indicates that this Excel file is designed to download and execute a malicious payload from one of the embedded URLs. The ClamAV detection as 'Xls.Malware.Valyria-10029771-0' further supports its malicious nature. The VBA script's primary function appears to be initiating the download process, likely leading to further infection.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
ClamAV: Xls.Malware.Valyria-10029771-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10029771-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.
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://94.140.114.44/
- http://103.155.92.211/
- http://193.38.54.149/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6ea0dcbce704cc9662a989ee429fec0894ed516bccab67b859e6a519d0cedde3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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