Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e75ed275fe9c2b35…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:59 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 4ec3f3ca655e8121c0205dcad9b0b128 SHA-1: 857fb88bdd599efef277b257fd16ffa5a7b1d0ad SHA-256: e75ed275fe9c2b35155e70c86c435225e2738df81d3f410cef418aa78491aad0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests malicious intent. While the exact payload is not clear from the truncated macro listing, the Auto_Open function is designed to execute arbitrary commands, likely leading to further compromise.

Heuristics 3

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6362 bytes
SHA-256: 3876ca242576877e195cc526614bd2ef674e3e57f0720d3cf7c3a6a7c9a994b6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hdm
' 0018     21 LABEL : Cell Value, String Constant - alFfzT len=0 
' 0018     22 LABEL : Cell Value, String Constant - AmtkwUI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G186 
' 0018     24 LABEL : Cell Value, String Constant - BBvFbVpBI len=0 
' 0018     25 LABEL : Cell Value, String Constant - BZKUUxuMXw len=0 
' 0018     20 LABEL : Cell Value, String Constant - cQTue len=0 
' 0018     25 LABEL : Cell Value, String Constant - edVhOgTOnM len=0 
' 0018     26 LABEL : Cell Value, String Constant - ehGlBILqZVs len=0 
' 0018     24 LABEL : Cell Value, String Constant - fGlvengYd len=0 
' 0018     21 LABEL : Cell Value, String Constant - iQgNTv len=0 
' 0018     22 LABEL : Cell Value, String Constant - KEYuFwH len=0 
' 0018     23 LABEL : Cell Value, String Constant - KigPqVma len=0 
' 0018     23 LABEL : Cell Value, String Constant - nHwuTYNR len=0 
' 0018     22 LABEL : Cell Value, String Constant - nzhUpBw len=0 
' 0018     26 LABEL : Cell Value, String Constant - QMpWkhGkfvz len=0 
' 0018     22 LABEL : Cell Value, String Constant - reZmSUP len=0 
' 0018     24 LABEL : Cell Value, String Constant - RyeXguKdQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - TtWqvHnwYkLn len=0 
' 0018     20 LABEL : Cell Value, String Constant - VyqRy len=0 
' 0018     22 LABEL : Cell Value, String Constant - XpsBrEp len=0 
' 0018     20 LABEL : Cell Value, String Constant - zdnWm len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST :
... (truncated)

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