Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 495616ffb8eb4951…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:08 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: f9bfd49e1514f6c827343eb0d3faea1d SHA-1: 45f720652af33b3be0cc412abd398591b4fcdf5d SHA-256: 495616ffb8eb49519764eb89fa75a4cce4b3037c72aad4e26fdd7db597e2d01b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open function. This function is designed to automatically execute when the workbook is opened, indicating a malicious intent to run arbitrary code. The presence of dangerous formula APIs further supports this assessment.

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) 6882 bytes
SHA-256: d353bff45daa2b390e002de60d795bc57b0c5dcb47bea0202b27c2c3b02788b8
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 -  gKpgRTPJZv
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B203 
' 0018     24 LABEL : Cell Value, String Constant - cikFPQWdt len=0 
' 0018     24 LABEL : Cell Value, String Constant - czuQkSJfg len=0 
' 0018     21 LABEL : Cell Value, String Constant - DIFCRW len=0 
' 0018     27 LABEL : Cell Value, String Constant - EzDmpQryFetB len=0 
' 0018     23 LABEL : Cell Value, String Constant - hWhjqRPV len=0 
' 0018     25 LABEL : Cell Value, String Constant - iBcXOrxOEV len=0 
' 0018     23 LABEL : Cell Value, String Constant - kVghHUmx len=0 
' 0018     24 LABEL : Cell Value, String Constant - meRokFTni len=0 
' 0018     23 LABEL : Cell Value, String Constant - OVrecgtF len=0 
' 0018     22 LABEL : Cell Value, String Constant - pgnFLuG len=0 
' 0018     24 LABEL : Cell Value, String Constant - PkMwkdgAp len=0 
' 0018     23 LABEL : Cell Value, String Constant - qCWsVpUm len=0 
' 0018     20 LABEL : Cell Value, String Constant - QWVRp len=0 
' 0018     25 LABEL : Cell Value, String Constant - SilCoGzzEW len=0 
' 0018     23 LABEL : Cell Value, String Constant - TvyTtbAk len=0 
' 0018     23 LABEL : Cell Value, String Constant - uOlEmxQO len=0 
' 0018     21 LABEL : Cell Value, String Constant - VKTDLV len=0 
' 0018     24 LABEL : Cell Value, String Constant - vxexgdcOz len=0 
' 0018     22 LABEL : Cell Value, String Constant - ysegzgP len=0 
' 0018     25 LABEL : Cell Value, String Constant - zbUCBSRZhH 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    
... (truncated)

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