Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 03b4fd34d0e2a74c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:10 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: a9716e1972169786fd54955d54dbaf05 SHA-1: 453110dc2f56ff22c9ce67862b2b5fa0adf9643d SHA-256: 03b4fd34d0e2a74c19b65ed0781010b8390b7037b59e7b50913bffcaefe352dd
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. The macro sheet likely serves as a loader for a second-stage payload, although the specific payload or download URL is not directly extractable from the provided 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) 6776 bytes
SHA-256: 0d2566b7c93f732fcc8a2e57e5898185f1c60595c0f2dd46060178dda0357692
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kJXxKIqX
' 0018     27 LABEL : Cell Value, String Constant - AEMhVRnZKfNU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B145 
' 0018     26 LABEL : Cell Value, String Constant - BncejJGBTMm len=0 
' 0018     21 LABEL : Cell Value, String Constant - cMWcdZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - cOAMOaZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - cUndEX len=0 
' 0018     21 LABEL : Cell Value, String Constant - dOfLsE len=0 
' 0018     25 LABEL : Cell Value, String Constant - dxghJzlYBu len=0 
' 0018     20 LABEL : Cell Value, String Constant - FljYj len=0 
' 0018     23 LABEL : Cell Value, String Constant - KmOCkDuv len=0 
' 0018     24 LABEL : Cell Value, String Constant - MOKulipuH len=0 
' 0018     20 LABEL : Cell Value, String Constant - MuwQB len=0 
' 0018     22 LABEL : Cell Value, String Constant - ODHxKdR len=0 
' 0018     26 LABEL : Cell Value, String Constant - OYSuBJZTbDR len=0 
' 0018     22 LABEL : Cell Value, String Constant - PtBXuvH len=0 
' 0018     24 LABEL : Cell Value, String Constant - pVbFLezMB len=0 
' 0018     21 LABEL : Cell Value, String Constant - rOIJSO len=0 
' 0018     23 LABEL : Cell Value, String Constant - RvFgCEAy len=0 
' 0018     26 LABEL : Cell Value, String Constant - uaBlrFfiTIw len=0 
' 0018     25 LABEL : Cell Value, String Constant - uHWGWDIAlI len=0 
' 0018     25 LABEL : Cell Value, String Constant - XthpHYlLQu 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 
... (truncated)

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