Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1eacaf36bff07cec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:59 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: 9024371f75b254988d39425aa08a8a56 SHA-1: e8f14ad9b9404751eef60f450114b852de40f203 SHA-256: 1eacaf36bff07cecf588243512ddf5f19a5a8d1f487cb6dd5134832090bb2195
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 defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute commands or download additional payloads. While no specific URLs or hashes were extracted, the technique strongly implies 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) 6616 bytes
SHA-256: bc6a2e16a83e92df257ff5a411a3a47595b0079bd0adbb6f29253580a83508af
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  gPIuhmvSx
' 0018     26 LABEL : Cell Value, String Constant - abJvZNWauro len=0 
' 0018     27 LABEL : Cell Value, String Constant - AlKBUZdFPbes len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I182 
' 0018     22 LABEL : Cell Value, String Constant - eNUqVZL len=0 
' 0018     20 LABEL : Cell Value, String Constant - fEJjd len=0 
' 0018     24 LABEL : Cell Value, String Constant - fKtNyDYax len=0 
' 0018     27 LABEL : Cell Value, String Constant - FSTwhCnCIgwP len=0 
' 0018     27 LABEL : Cell Value, String Constant - gQdAoGTKaWqX len=0 
' 0018     23 LABEL : Cell Value, String Constant - hOcrzfAG len=0 
' 0018     20 LABEL : Cell Value, String Constant - kskvf len=0 
' 0018     20 LABEL : Cell Value, String Constant - LadHa len=0 
' 0018     23 LABEL : Cell Value, String Constant - OaBYKZdi len=0 
' 0018     24 LABEL : Cell Value, String Constant - ovignVcIq len=0 
' 0018     25 LABEL : Cell Value, String Constant - rbtgBnHcNd len=0 
' 0018     20 LABEL : Cell Value, String Constant - SuYxo len=0 
' 0018     26 LABEL : Cell Value, String Constant - TRWVIzSqEOd len=0 
' 0018     20 LABEL : Cell Value, String Constant - uLDig len=0 
' 0018     26 LABEL : Cell Value, String Constant - vUeFHeuhHto len=0 
' 0018     23 LABEL : Cell Value, String Constant - wFaChGuY len=0 
' 0018     27 LABEL : Cell Value, String Constant - YnEcahFDfUWD len=0 
' 0018     26 LABEL : Cell Value, String Constant - yUQZNklvZRM 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
'
... (truncated)

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