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

Static analysis result for SHA-256 7a214185f45d3b0e…

MALICIOUS

Office (OLE) / .XLSX

52.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 839f1be5007843df03368e8e9102659a SHA-1: 2252a7f749ae230ba9bdec2d217984250ba3666e SHA-256: 7a214185f45d3b0e376ea4cbcdf68e5bdc0dc030f9410f0873667723435f826a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically upon opening. The macros attempt to download a payload from the URL http://soberlifeco.com/contra/storage.php using the command 'ndll32.exe,DllRegisterServer'. This is a common technique for delivering second-stage malware.

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

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