Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a25b78cdb3ee489…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:33 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 15d98f9fa2ca3e389f780f5cfa015222 SHA-1: ac167f345a904e6dcfe27aef8f4c700431659687 SHA-256: 2a25b78cdb3ee489a05dda4ada7b048cb33b272911e38aa66342e379d7797cb2
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. Heuristics indicate the presence of an Auto_Open defined name, which is a common technique for automatically executing malicious code upon opening the workbook. The macro sheet contains a reference to 'Auto_Open' and uses dangerous formula APIs, suggesting it's designed to download and execute a secondary payload. No specific family could be identified.

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) 6715 bytes
SHA-256: e2d8a1e0cf1581548e64009fe71598eb4ed0a49431a4a0bf9e1c9ebbdc71787b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PQIVybJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A163 
' 0018     21 LABEL : Cell Value, String Constant - BbgcJr len=0 
' 0018     23 LABEL : Cell Value, String Constant - enEMBYah len=0 
' 0018     22 LABEL : Cell Value, String Constant - FDMGgau len=0 
' 0018     27 LABEL : Cell Value, String Constant - FimhdbKyTJhj len=0 
' 0018     27 LABEL : Cell Value, String Constant - gUpxGcpHPwuv len=0 
' 0018     23 LABEL : Cell Value, String Constant - hMyQSTCr len=0 
' 0018     23 LABEL : Cell Value, String Constant - JEsHaRnb len=0 
' 0018     22 LABEL : Cell Value, String Constant - KHOansE len=0 
' 0018     25 LABEL : Cell Value, String Constant - loCrhOZxXc len=0 
' 0018     24 LABEL : Cell Value, String Constant - OraaCaYNU len=0 
' 0018     24 LABEL : Cell Value, String Constant - owDEfmYmu len=0 
' 0018     21 LABEL : Cell Value, String Constant - QHXIKI len=0 
' 0018     22 LABEL : Cell Value, String Constant - SAJwFad len=0 
' 0018     20 LABEL : Cell Value, String Constant - sMWMU len=0 
' 0018     25 LABEL : Cell Value, String Constant - USZkxJEJcB len=0 
' 0018     20 LABEL : Cell Value, String Constant - VfLsf len=0 
' 0018     22 LABEL : Cell Value, String Constant - wimxKHF len=0 
' 0018     27 LABEL : Cell Value, String Constant - xzmniXFUhWsG len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZjiWaTuyWv len=0 
' 0018     27 LABEL : Cell Value, String Constant - zTRSzCQEqYUA 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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