Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e8cab613ad740b49…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:44 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 72fb2e89a9bd2fc3a301faa1ad03e7ba SHA-1: 183e113decfb86b75a579a8b45eae91de49b2cfc SHA-256: e8cab613ad740b49b822f29d3945c42aa0e40927f689ef9122ab669b58bf7b54
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document detected with critical heuristics for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN, indicating the presence of an Auto_Open macro that uses dangerous functions. The macro sheet contains an Auto_Open defined name, suggesting an attempt to automatically execute code when the workbook is opened. The specific functions used within the macro are not fully detailed, but the presence of Auto_Open and dangerous APIs strongly implies an intent to execute arbitrary code.

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) 6772 bytes
SHA-256: 0e5ba45db051ac3b86119aa3727a0d4a0064699d126ebdc1ca6b22de499d970e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  anWViRcn
' 0018     20 LABEL : Cell Value, String Constant - aOWCe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C129 
' 0018     22 LABEL : Cell Value, String Constant - BeGLFXJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - BLCnp len=0 
' 0018     27 LABEL : Cell Value, String Constant - bZpkWvgGacqL len=0 
' 0018     23 LABEL : Cell Value, String Constant - clVHubXw len=0 
' 0018     22 LABEL : Cell Value, String Constant - HnkLuvr len=0 
' 0018     23 LABEL : Cell Value, String Constant - mJaRXmje len=0 
' 0018     27 LABEL : Cell Value, String Constant - NdpGpVCHCqMX len=0 
' 0018     27 LABEL : Cell Value, String Constant - NMlJaPAlEXbp len=0 
' 0018     24 LABEL : Cell Value, String Constant - nQAMiQkNJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - oxuTDYPbgHP len=0 
' 0018     25 LABEL : Cell Value, String Constant - PcBYpoOuHs len=0 
' 0018     23 LABEL : Cell Value, String Constant - PqTaaglS len=0 
' 0018     23 LABEL : Cell Value, String Constant - qmVRIfFf len=0 
' 0018     26 LABEL : Cell Value, String Constant - rQyeIWaGnbv len=0 
' 0018     24 LABEL : Cell Value, String Constant - sKFiqtswR len=0 
' 0018     22 LABEL : Cell Value, String Constant - SXQftVb len=0 
' 0018     25 LABEL : Cell Value, String Constant - UPGcZZqTqW len=0 
' 0018     24 LABEL : Cell Value, String Constant - VRGRjjfxQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - yBboyQXlZPtG 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/ SS
... (truncated)

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