Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6cea565468bbae39…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:35 Authoring application: Microsoft Excel First seen: 2021-10-01
MD5: 6e4294bbe490aa531e0fe043f65b4a7d SHA-1: 8457a60b51896a05bc410db387834fdab5a32641 SHA-256: 6cea565468bbae390bf60ab86ed6ac628a5b4dbbd4fda55f61134c2253a617d6
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 upon opening. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands or exploit vulnerabilities. No specific malware family could be identified from the available evidence.

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) 6598 bytes
SHA-256: 462329ee2efd69323673a0a6011cf0979b2bcd1987b1bea2035435db25bdbf4a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iSnw
' 0018     26 LABEL : Cell Value, String Constant - AIQCStXQfhd len=0 
' 0018     24 LABEL : Cell Value, String Constant - ASOyHiJuT len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D183 
' 0018     22 LABEL : Cell Value, String Constant - bzsxKHS len=0 
' 0018     20 LABEL : Cell Value, String Constant - fhaqc len=0 
' 0018     26 LABEL : Cell Value, String Constant - GkNXVHMrezI len=0 
' 0018     20 LABEL : Cell Value, String Constant - HoClM len=0 
' 0018     20 LABEL : Cell Value, String Constant - hsSOb len=0 
' 0018     22 LABEL : Cell Value, String Constant - hStfTbP len=0 
' 0018     24 LABEL : Cell Value, String Constant - JbcKLwaEm len=0 
' 0018     27 LABEL : Cell Value, String Constant - kXBhmlftnAse len=0 
' 0018     24 LABEL : Cell Value, String Constant - MESrJbDQd len=0 
' 0018     26 LABEL : Cell Value, String Constant - nmTjgCucTzL len=0 
' 0018     22 LABEL : Cell Value, String Constant - OrOuKVB len=0 
' 0018     26 LABEL : Cell Value, String Constant - wENbAbIrlUc len=0 
' 0018     24 LABEL : Cell Value, String Constant - wjNVHxoTl len=0 
' 0018     23 LABEL : Cell Value, String Constant - wNcRXTip len=0 
' 0018     24 LABEL : Cell Value, String Constant - wPdqPqRsf len=0 
' 0018     22 LABEL : Cell Value, String Constant - wyJsibw len=0 
' 0018     21 LABEL : Cell Value, String Constant - YagdPb len=0 
' 0018     27 LABEL : Cell Value, String Constant - yALZDJSaHTSr 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     1
... (truncated)

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