Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eecbc875ff3422f5…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:16 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: 5eca4553090469b62899162f41509fc2 SHA-1: 9dd752dd0a0bdcc309fe153a63f1749b11e80654 SHA-256: eecbc875ff3422f5483fcb1d7ef5f92860874bc58efe7a6dc7a90a3b210b6395
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 the execution of potentially malicious code upon opening the workbook. The presence of dangerous formula APIs further supports this. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its malicious functionality.

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) 6843 bytes
SHA-256: 1d4aa0621cfc1cf7fb2382ca1371a6fcfd3efea55fde7d252987269535a116b9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BhDUlMfGMq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H167 
' 0018     25 LABEL : Cell Value, String Constant - BdwCDKewdD len=0 
' 0018     21 LABEL : Cell Value, String Constant - CkwXTg len=0 
' 0018     26 LABEL : Cell Value, String Constant - cshtGYoBdfN len=0 
' 0018     27 LABEL : Cell Value, String Constant - EArdtnfsKlfS len=0 
' 0018     22 LABEL : Cell Value, String Constant - ehDWRUh len=0 
' 0018     23 LABEL : Cell Value, String Constant - IehZGujP len=0 
' 0018     23 LABEL : Cell Value, String Constant - JWGTGNHT len=0 
' 0018     25 LABEL : Cell Value, String Constant - JxRLxvWgRh len=0 
' 0018     20 LABEL : Cell Value, String Constant - kFGjt len=0 
' 0018     25 LABEL : Cell Value, String Constant - kqpzcQjWhG len=0 
' 0018     24 LABEL : Cell Value, String Constant - LzkXZMikS len=0 
' 0018     27 LABEL : Cell Value, String Constant - MitzIkjRUvPX len=0 
' 0018     25 LABEL : Cell Value, String Constant - QrreBpcQAC len=0 
' 0018     20 LABEL : Cell Value, String Constant - RGkfD len=0 
' 0018     21 LABEL : Cell Value, String Constant - RttkPd len=0 
' 0018     24 LABEL : Cell Value, String Constant - ughUnRDMl len=0 
' 0018     27 LABEL : Cell Value, String Constant - wHxHFWsvUEbP len=0 
' 0018     23 LABEL : Cell Value, String Constant - WqqfaqDR len=0 
' 0018     20 LABEL : Cell Value, String Constant - wzaBs len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZBejZOFeNDk 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
' 
... (truncated)

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