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

Static analysis result for SHA-256 35cf92b551f09ba6…

MALICIOUS

Office (OLE) / .XLS

756.5 KB Created: 2020-12-03 22:00:53 Authoring application: Microsoft Excel
MD5: 8cc0e4d5044939ef3d7a7d8825d8c9c9 SHA-1: 61ca1ae2ac0fa0fb0f075ee09f9ff83985b5b66b SHA-256: 35cf92b551f09ba61770ce1c7c5dc73b3c3e291eb98948c87d430646370a103f
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. The macro uses the EXEC function to run a constructed path, 'C:\PROGRAMDATA\a.exe', and also contains a formula that reconstructs the URL 'https://www.seyranikenger.com.tr/mensajeria_system.exe' to download and save an executable. This indicates the macro's intent is to download and execute a second-stage payload.

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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
2b2c1604688a035eb2591a3f9181e19813fe7e418f3196f7efba4af943c73913		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1538 bytes
macros.bas
9b7e54b6c255d0b7f2d20df1a4915e73b8da64865e1bb509a073158c11b8a368		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 628 bytes

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