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

Static analysis result for SHA-256 cbc32a47b75b7649…

MALICIOUS

Office (OLE) / .XLS

52.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: d1ed30345d48bb8094ffbc6dd192682d SHA-1: d0520efe00a2e37934bf95e1434c1f8d82842946 SHA-256: cbc32a47b75b76493d43e5709bf8e5b604b0e4bc28bc7eeedaa69a191dd153fc
160 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled XLS file. It contains an Auto_Open macro that uses the RUN function, indicating it attempts to execute a command. 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 suggests the document also contains social engineering to trick the user into enabling macros.

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