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

Static analysis result for SHA-256 d8032c71de22af1a…

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2020-09-20 21:17:44
MD5: 85a5ea8dcd78a8df15d7e49bb5f22387 SHA-1: 4f3765768183cbf79e220df9a15ca778c2385b64 SHA-256: d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. This indicates an attempt to execute arbitrary commands, likely to download and run a second-stage payload from the embedded URL. The presence of a visible command execution instruction further supports this. Confidence is high due to the clear macro execution and command execution indicators.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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://tinyurl.com/y677kmz8

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5dbcfcc6305f9b16954822a600cede360d27ac6ec43df46e2fb0ceaaf4418359
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1023 bytes