Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bb3ed17011986c65…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:16 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: d37aab40015c5304075774721eaff30c SHA-1: 12ab3e8d968efa33d82fd9784f8d3e8392e596b4 SHA-256: bb3ed17011986c65895ab9e3dea4155a28f5a57a0f66b471bc846d65bbed4466
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, including an Auto_Open defined name, which is a critical indicator of malicious intent. The macros utilize dangerous formula APIs, suggesting they are designed to execute arbitrary code or download further payloads. The presence of an Auto_Open entry indicates that the malicious macro will execute automatically when the workbook is opened.

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) 6712 bytes
SHA-256: 7867fc975f5e43dff7c9c09245e93eacbb1393de73560e556aba518fba5c9e75
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 -  HYxGOQU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I183 
' 0018     21 LABEL : Cell Value, String Constant - AzHxyI len=0 
' 0018     21 LABEL : Cell Value, String Constant - bXTuUq len=0 
' 0018     25 LABEL : Cell Value, String Constant - FCvAtNefQK len=0 
' 0018     27 LABEL : Cell Value, String Constant - FIpZXmphhYvp len=0 
' 0018     27 LABEL : Cell Value, String Constant - GjYGnOTXTpIY len=0 
' 0018     21 LABEL : Cell Value, String Constant - gSZSGt len=0 
' 0018     25 LABEL : Cell Value, String Constant - HhsALpjtHi len=0 
' 0018     26 LABEL : Cell Value, String Constant - hhsNzsZJzOh len=0 
' 0018     27 LABEL : Cell Value, String Constant - hiGfbpHfFafB len=0 
' 0018     20 LABEL : Cell Value, String Constant - jbpwD len=0 
' 0018     25 LABEL : Cell Value, String Constant - MTZpsQmkpQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - nUMggNdu len=0 
' 0018     21 LABEL : Cell Value, String Constant - PKJjyK len=0 
' 0018     27 LABEL : Cell Value, String Constant - QYCoHMhEFOil len=0 
' 0018     21 LABEL : Cell Value, String Constant - rptUmH len=0 
' 0018     24 LABEL : Cell Value, String Constant - RUXzWgSsi len=0 
' 0018     23 LABEL : Cell Value, String Constant - vRcMZjIF len=0 
' 0018     22 LABEL : Cell Value, String Constant - wSKcSnH len=0 
' 0018     25 LABEL : Cell Value, String Constant - WtpXrBjJze len=0 
' 0018     20 LABEL : Cell Value, String Constant - XmWoe 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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