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

Static analysis result for SHA-256 af72b0f54466ae9f…

MALICIOUS

Office (OLE) / .XLS

108.5 KB Created: 2021-10-03 23:25:03 Authoring application: Microsoft Excel
MD5: cf47e39e2a5603c1a77d863dd62fff6a SHA-1: 5bddddea707485a54cdaaedeb55bee873e6d0ade SHA-256: af72b0f54466ae9f1d8a36111e6ee9a7205696b4935d5b5653b3aaa24b11e861
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The Workbook_Open macro is triggered upon opening the Excel file. It constructs a batch file at C:\Users\Public\Documents\god.bat. This batch file contains a PowerShell command to download an executable from http://ddl8.data.hu/get/317983/13078369/YConsoleApp112.exe and save it as C:\Users\Public\Documents\affectmake.exe. The batch file then executes the downloaded file. The use of GetObject and Workbook_Open heuristics, along with the script's behavior, strongly indicates a downloader functionality.

Heuristics 4

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a7aa41f7a47db7d9f0b5752f8eb12b366f8433bf1b10e7d88dbc38cf474e7054		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1346 bytes

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