Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c52607ef86ec2b0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:37 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: d25ec8a25bc4862e1be0d7e570e20364 SHA-1: c179e673616f92fa83b129b6075578f947aee542 SHA-256: 6c52607ef86ec2b08764bbbdd07576789828544af1a5a276e478434116af05d6
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code. The macro sheet contains a reference to a dangerous formula API (RUN=0), suggesting it is intended to execute an external payload. No specific URLs or further script content were extracted to identify the payload or family.

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) 6502 bytes
SHA-256: 0a24d34890cd5a00d654b359b9c7f35f886da9f7d714076d9284beff5f130b8a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nfzHJo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H150 
' 0018     27 LABEL : Cell Value, String Constant - cEluGSdfHDuB len=0 
' 0018     24 LABEL : Cell Value, String Constant - CGkNsmTrA len=0 
' 0018     26 LABEL : Cell Value, String Constant - DHCUsAdWQdr len=0 
' 0018     22 LABEL : Cell Value, String Constant - DiTGFBL len=0 
' 0018     24 LABEL : Cell Value, String Constant - EVWTLlgpj len=0 
' 0018     22 LABEL : Cell Value, String Constant - Fcgrwvq len=0 
' 0018     26 LABEL : Cell Value, String Constant - FdgYkzStaOL len=0 
' 0018     26 LABEL : Cell Value, String Constant - hknFCVrVVVJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - hlmlTpGagkCk len=0 
' 0018     26 LABEL : Cell Value, String Constant - JKYvRpuQVFK len=0 
' 0018     22 LABEL : Cell Value, String Constant - jLUDeGY len=0 
' 0018     21 LABEL : Cell Value, String Constant - MrrKoR len=0 
' 0018     24 LABEL : Cell Value, String Constant - ogZDpRyMz len=0 
' 0018     27 LABEL : Cell Value, String Constant - RkTsaiStSMkK len=0 
' 0018     21 LABEL : Cell Value, String Constant - sGFrqb len=0 
' 0018     25 LABEL : Cell Value, String Constant - sTiRRquKTN len=0 
' 0018     20 LABEL : Cell Value, String Constant - tPbxn len=0 
' 0018     24 LABEL : Cell Value, String Constant - XixvcrqGW len=0 
' 0018     24 LABEL : Cell Value, String Constant - YRxkDqYyG len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZUtBVxxqbmvl 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/
... (truncated)

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