Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 301e8086eeb9a6d8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:25:15 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 4b04a79b3d7c1f0456a54e9c18f5a16b SHA-1: b9d20cf3b3d26762ca310f9bef767293b76c4363 SHA-256: 301e8086eeb9a6d823a5a5f28ff0473625489b41e526c2c9592579c3d537839f
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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) 6793 bytes
SHA-256: 4d4341db0bad81b6109b67a97c340fe8ee9415ea5389eef845d521e2314f2d97
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tebFQfYyDg
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D156 
' 0018     27 LABEL : Cell Value, String Constant - bzSOTUQAwjxF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ckjtGTte len=0 
' 0018     26 LABEL : Cell Value, String Constant - CxpmJURazbe len=0 
' 0018     26 LABEL : Cell Value, String Constant - EyuhNTDzBZN len=0 
' 0018     24 LABEL : Cell Value, String Constant - FBhhcdRVd len=0 
' 0018     24 LABEL : Cell Value, String Constant - fgJFUZhCi len=0 
' 0018     20 LABEL : Cell Value, String Constant - FQpNE len=0 
' 0018     26 LABEL : Cell Value, String Constant - FVfbWRLUlJa len=0 
' 0018     24 LABEL : Cell Value, String Constant - gPtOhkVpK len=0 
' 0018     22 LABEL : Cell Value, String Constant - kZlrMfP len=0 
' 0018     26 LABEL : Cell Value, String Constant - mLKjXChsPKU len=0 
' 0018     23 LABEL : Cell Value, String Constant - NWWMkUCh len=0 
' 0018     25 LABEL : Cell Value, String Constant - OTiTTFfjOy len=0 
' 0018     22 LABEL : Cell Value, String Constant - pZhknNb len=0 
' 0018     26 LABEL : Cell Value, String Constant - qGBVnknRAGh len=0 
' 0018     25 LABEL : Cell Value, String Constant - RajxLAcbuR len=0 
' 0018     27 LABEL : Cell Value, String Constant - RZTIliPXYxjV len=0 
' 0018     27 LABEL : Cell Value, String Constant - uyEWFRjrddTk len=0 
' 0018     25 LABEL : Cell Value, String Constant - xHrmFpNCdZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ymlPhoplZWt 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, Str
... (truncated)

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