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

Static analysis result for SHA-256 026c54c38be34fc0…

MALICIOUS

Office (OLE) / .XLSX

117.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-09-28
MD5: 88996692facf9e3b7a3029bd5dd0b8f9 SHA-1: a03ff5e6754d681ff5f36127bef77fa621a795ee SHA-256: 026c54c38be34fc0438340416799d17dfa31c43ae0d4090177ca957661b80b58
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The sample contains VBA macros that trigger a Shell() execution upon workbook closure. This is further supported by heuristics indicating PowerShell references and p-code execution. The script concatenates several strings to form the command executed by Shell(), but the exact command is not fully reconstructible due to truncation. The primary intent appears to be executing an arbitrary command.

Heuristics 4

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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
662db1332768088c84a4d96fe1de2e08e6895ac59ba288341b65b6448dc4b80f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4587 bytes

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