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

Static analysis result for SHA-256 385eead4433d5af8…

MALICIOUS

Office (OLE) / .XLS

71.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-07
MD5: 83ec36d705618260b2405e75380320d3 SHA-1: 193c1633e3b533a97d676d8bc8f704085331b775 SHA-256: 385eead4433d5af8a091282fa5c0fd98bf431b3a19b2880c67e355605d34fe52
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Execution T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious File Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical indicator of malicious intent. The macros are designed to execute dangerous functions, including the RUN API. The script concatenates multiple URLs, which are likely used to download and execute a secondary payload. The reconstructed URLs are: "http://www.adiputranto.com/berkas/NheD9D3UM3NcmSPRYeQ/", "https://natayakim.com/personal/o0sKIzRjM/", "http://meta4media.com/portfolio2/flb3iuglypsbqT/", and "http://hathaabeach.com/documents/zNsC/".

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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b4f0a647cf6176132ebc9ecde0dbe63bae14d0fc3c1b3805926fc56fef0b0f6a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7650 bytes

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