Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f021698823e473ff…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:06 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 9e53f14bf86547dbc2708e03cd9342be SHA-1: c810d53876a2c41659d67b31b9b4bd47c2c94521 SHA-256: f021698823e473ffaafdd8167ffc1b58614a8d7a27d55255322394b4773755a7
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 defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This functionality is likely used to download and execute a secondary payload, making it a downloader or initial execution stage for further malicious activity.

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) 6672 bytes
SHA-256: ff77ec9a12d1de0f8f5bd94151c3759e5d3200fb6f2c898b689190871adc573c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  prQCm
' 0018     26 LABEL : Cell Value, String Constant - afmTTvcgdzf len=0 
' 0018     20 LABEL : Cell Value, String Constant - AuQro len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D145 
' 0018     23 LABEL : Cell Value, String Constant - DBTQGxhj len=0 
' 0018     21 LABEL : Cell Value, String Constant - eFDibD len=0 
' 0018     25 LABEL : Cell Value, String Constant - EkiAzyJbFR len=0 
' 0018     27 LABEL : Cell Value, String Constant - ekJnNWlLqVka len=0 
' 0018     25 LABEL : Cell Value, String Constant - kvKZdeWAFa len=0 
' 0018     22 LABEL : Cell Value, String Constant - LUNbwvd len=0 
' 0018     27 LABEL : Cell Value, String Constant - nKqUJQBgPlTY len=0 
' 0018     27 LABEL : Cell Value, String Constant - nlLoLeupVPEW len=0 
' 0018     22 LABEL : Cell Value, String Constant - PUDYKdk len=0 
' 0018     27 LABEL : Cell Value, String Constant - pUsFtdOBuhqj len=0 
' 0018     24 LABEL : Cell Value, String Constant - RlqTIMftc len=0 
' 0018     27 LABEL : Cell Value, String Constant - tEUFTDODBwJt len=0 
' 0018     24 LABEL : Cell Value, String Constant - TPAzeYkob len=0 
' 0018     26 LABEL : Cell Value, String Constant - UPzJsclgaAG len=0 
' 0018     24 LABEL : Cell Value, String Constant - wilDHXAOi len=0 
' 0018     27 LABEL : Cell Value, String Constant - WUvUaafkcvAt len=0 
' 0018     22 LABEL : Cell Value, String Constant - WWhyLDW len=0 
' 0018     26 LABEL : Cell Value, String Constant - zmyheBgpTrJ 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 Con
... (truncated)

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