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

Static analysis result for SHA-256 f45ebff001b7fa76…

MALICIOUS

Office (OLE) / .XLS

26.0 KB Created: 2021-07-29 19:03:34 Authoring application: Microsoft Excel First seen: 2022-07-21
MD5: 93c0cd17d1ba73dbe550a0b5525b24ba SHA-1: cf2b0960b76b34ebcf3649bd6b5d9fa652f263be SHA-256: f45ebff001b7fa76fd16e689dba1d490ec7aedf2624c3e0b982af15700050c2f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Execution T1204.002 Malicious File Execution: Malicious File Execution

The sample is an Excel 4.0 macro-enabled spreadsheet that uses a lure to trick the user into enabling macros. Upon enabling, it executes an Auto_Open macro which likely downloads and executes a payload from the embedded URL. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'POWERshEll.ExE wGet https://' further supports the execution of a command-line tool to fetch a payload.

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.
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www56.zippyshare.com/d/KkGSo0MT/18509/11.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
fdfd572f634ae55a07391955f3661b232b451319e0332e9c9420c1f0f6ed7794		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 974 bytes

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