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

Static analysis result for SHA-256 cf0241d2c15a6d53…

MALICIOUS

Office (OLE) / .XLS

107.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: ec20e8cd900fef754164aeb305ff2722 SHA-1: f5a55d22dd6990c023c1048a10681500e99f282f SHA-256: cf0241d2c15a6d53608c875b3dfa13959fe6af3ae1c01a71d5e85d3346c9af5b
168 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled document that uses an Auto_Open macro to execute. It displays a lure to enable macros, which is a common technique for malware droppers. The XLM macro contains a call to the RUN function, indicating it attempts to execute a downloaded payload from the URL hxxps://jjcc.ccjj.php.l2iri21ea7c4rmp.xyz/index.php, and also references a local executable "..\basykk.exe".

Heuristics 5

  • 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
  • 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
bf10c0361ae4c3503bd4e6910d06aa624aaa476d05971e830d19e3f8772e90ef		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 10940 bytes
macros.bas
7916b49f492340215f93bdcac5c75bb71d9699243e51aeef180e5d113716e478		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 358 bytes

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