Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9888bd064d59941c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:34 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 857ee4951a9569140e788f36ef79cda2 SHA-1: 1705a2c28e35626bb75ca249fe1187d1d94a3bef SHA-256: 9888bd064d59941cb2ddb7d03cc2f197c1f8684759dcd077e15f102fddcbd990
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 further suggests malicious intent. While the exact payload is not clear from the static analysis, the Auto_Open macro is designed to execute arbitrary commands, likely leading to further compromise.

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) 6798 bytes
SHA-256: 853bd1c9af4ff8a66e3bb26401470c4ce7f59d3a5e35b26f4c9389629e844600
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 -  siaNzBWF
' 0018     21 LABEL : Cell Value, String Constant - atnADr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I150 
' 0018     26 LABEL : Cell Value, String Constant - dGWkGXxatOW len=0 
' 0018     27 LABEL : Cell Value, String Constant - FBKsAuzTmVGG len=0 
' 0018     20 LABEL : Cell Value, String Constant - hOKxU len=0 
' 0018     21 LABEL : Cell Value, String Constant - mfCyII len=0 
' 0018     23 LABEL : Cell Value, String Constant - OhkQkBYe len=0 
' 0018     25 LABEL : Cell Value, String Constant - rFMrRUIFbW len=0 
' 0018     23 LABEL : Cell Value, String Constant - RLkNSZyB len=0 
' 0018     21 LABEL : Cell Value, String Constant - SkfZbo len=0 
' 0018     26 LABEL : Cell Value, String Constant - srmNXaDaUmj len=0 
' 0018     20 LABEL : Cell Value, String Constant - tDGnM len=0 
' 0018     27 LABEL : Cell Value, String Constant - TrWcnvlNNnJB len=0 
' 0018     22 LABEL : Cell Value, String Constant - UAeHleY len=0 
' 0018     23 LABEL : Cell Value, String Constant - UMXnIGfu len=0 
' 0018     20 LABEL : Cell Value, String Constant - wkWOW len=0 
' 0018     27 LABEL : Cell Value, String Constant - wLmkNGFVyqSP len=0 
' 0018     23 LABEL : Cell Value, String Constant - wUIKbJCK len=0 
' 0018     24 LABEL : Cell Value, String Constant - wVtITRnNy len=0 
' 0018     23 LABEL : Cell Value, String Constant - YMtpmESU len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZkJeajPtjla 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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