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

Static analysis result for SHA-256 5a0463ae1bcc9347…

MALICIOUS

Office (OLE) / .XLS

52.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7f05d342c5f2f6ea6a105f32037304f0 SHA-1: e371941967fcd6b38ef85760ac07bc13d204a909 SHA-256: 5a0463ae1bcc93478a6d8edc0304ef6c18ad4c0c5e245b297d6f00e3177e97e9
160 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 function, which is a known technique for executing malicious code upon opening the document. The macro is designed to download a payload from the URL 'http://soberlifeco.com/contra/storage.php'. The presence of the 'SE_ENABLE_LURE' heuristic indicates that the document likely prompts the user to enable macros, further facilitating the execution of the malicious script.

Heuristics 4

  • 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.
  • 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
8509a320b6dbe8e21a7582aae9f5aadecc10d9edb75bf6b48bb45573378d0698
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2322 bytes