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

Static analysis result for SHA-256 b1ff973b89fefe8e…

MALICIOUS

Office (OLE) / .XLS

80.5 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel
MD5: d319b978343bf300e26196e948309244 SHA-1: 3990e5dc2e3111a0c3764a2b548577de3b8332d8 SHA-256: b1ff973b89fefe8eacef29bda465633472bcb5d5a65bb1ddabbbb591cb95dc84
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 PowerShell T1059.001 PowerShell T1204.002 Malicious File

The critical OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics indicate the presence of an Excel 4.0 macro designed to execute code. The macro reconstructs and executes a PowerShell command to download a file named 'ye.exe' from 'https://tinyurl.com/ybl2prfj' and then executes it from the user's AppData directory. The VBA project contains no executable statements, indicating the primary malicious logic resides within the XLM macro.

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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4ba313a5408aa955180f2c248b56f07fd8a0c1170896b6f7fa77bfe32583c914		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1829 bytes
macros.bas
8bed49825dc7fe67a44a1e268cf275fafb14b7b63a2f9dbfc287bca4aaad1cab		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 640 bytes

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