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

Static analysis result for SHA-256 c2283d9d0917f36a…

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: e3ef4e5798aefd57925a449e0efda671 SHA-1: d3306b452daa516222c83ab4d50a31098e186ef2 SHA-256: c2283d9d0917f36abb730abb706f9e8d2b622034d8936e1577ac0f30995a40d0
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute a batch script, Outlook.bat, which is written to the user's Public directory. This script appears to be obfuscated but contains references to cmd.exe and uses string concatenation to construct commands, likely for downloading and executing a second-stage payload. The use of Environ("Public") indicates an attempt to write malicious files to a common, accessible location.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9aae994c2e1c1317470f797f5379b50ed17f44f406e21538b812f3b5e27660ed		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5486 bytes

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