Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a2fd97ecd956f258…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:25:42 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 6ba3ce3e1e066262fdc6c8164a949147 SHA-1: 5a4f4156de80a68bc1147baa5dcdc5f695f7f788 SHA-256: a2fd97ecd956f25857308fbb5de18900b32f1e9c746a66548a224651bf2cdd94
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 workbook containing an Auto_Open function, which is a common technique for executing malicious code. The heuristics indicate the presence of dangerous formula APIs within the macro, suggesting it's designed to perform harmful actions. No specific IOCs like URLs or hashes were extracted, but the Auto_Open macro itself is the primary indicator of malicious intent.

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) 6401 bytes
SHA-256: f82f0cc3703501d2b1e5fe0f56b7c98afcd92cde9f13e1840d8dfee9e2c9bf16
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  JvaqUt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C135 
' 0018     23 LABEL : Cell Value, String Constant - FGWXqDxV len=0 
' 0018     26 LABEL : Cell Value, String Constant - gUKaamrOrQj len=0 
' 0018     22 LABEL : Cell Value, String Constant - hbAwnrm len=0 
' 0018     24 LABEL : Cell Value, String Constant - HpduLRCMC len=0 
' 0018     20 LABEL : Cell Value, String Constant - IAloK len=0 
' 0018     21 LABEL : Cell Value, String Constant - IKEFys len=0 
' 0018     23 LABEL : Cell Value, String Constant - kKbnjIcW len=0 
' 0018     20 LABEL : Cell Value, String Constant - kUnQt len=0 
' 0018     22 LABEL : Cell Value, String Constant - mcEixUU len=0 
' 0018     22 LABEL : Cell Value, String Constant - mPvdvlB len=0 
' 0018     20 LABEL : Cell Value, String Constant - NyKfV len=0 
' 0018     22 LABEL : Cell Value, String Constant - pbDqiyY len=0 
' 0018     23 LABEL : Cell Value, String Constant - RbIqHUKT len=0 
' 0018     20 LABEL : Cell Value, String Constant - RELNY len=0 
' 0018     22 LABEL : Cell Value, String Constant - ricDVFH len=0 
' 0018     25 LABEL : Cell Value, String Constant - VBDJVekXEb len=0 
' 0018     21 LABEL : Cell Value, String Constant - vvezaU len=0 
' 0018     20 LABEL : Cell Value, String Constant - vZHPq len=0 
' 0018     25 LABEL : Cell Value, String Constant - yyEaOoFvbD len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZMhsYfmWmV 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 : Cell Valu
... (truncated)

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