Office (OLE) / .XLSX malware analysis — malicious · 3982ae3e61a6ba86

MALICIOUS

Office (OLE) / .XLSX

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

MD5: b4b3a2223765ac84c9b1b05dbf7c6503 SHA-1: 57bc35cb0c7a9ac6e7fcb5dea5c211fe5eda5fe0 SHA-256: 3982ae3e61a6ba86d61bd8f017f6238cc9afeb08b785010d686716e8415b6a36

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The file is an Excel spreadsheet containing VBA macros, including an Auto_Open subroutine, which is a common technique for executing malicious code upon opening. The heuristics indicate the use of URLDownloadToFile API, suggesting the macro attempts to download a payload from one of the embedded URLs. The ClamAV detection further confirms its malicious nature as a downloader. The VBA code is truncated, but the presence of Auto_Open and the URLDownloadToFile API firing strongly suggest the intent is to download and execute a second-stage payload from the provided URLs.

Heuristics 7

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
ClamAV: Doc.Downloader.Docusign112100-9908075-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign112100-9908075-0
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://190.14.37.178/
- http://185.183.96.67/
- http://185.250.148.213/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `2ad1c1f87f2f014cbe63ca2d48e08b26c2e70089c21e82116f929d26c50b2d3f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3654 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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