Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 7a088dc1d48d4bf3…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a44001f4a33cf626d2ce4e66bad0a726 SHA-1: 0ee0917367a838f3dbc83af3cf2ed26ded635458 SHA-256: 7a088dc1d48d4bf3528bc2fe448e661886a6f6ebbaf88b0677baef6a3223fbc4
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros with an Auto_Open defined name, indicating automatic execution upon opening. The macros utilize dangerous functions like RUN and CALL, and construct strings that appear to be part of a command execution chain. One such constructed command is CALL("Urn","UreA","IICCII",0, DocuSig!FE100, DocuSig!BN62& DocuSig!BN77& DocuSig!BN91,0,0), which likely downloads and executes a payload from a remote source, evidenced by the embedded URL https://zerones.biz/ds/261120.gif.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://zerones.biz/ds/261120.gif
    • https://zerones.biz/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7fbdfe5319125c7a88728c7d99286583a9907fcc6c0161898412d727b081f128		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6676 bytes

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