Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fafaca5317436edd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:30 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 09abcfc9f416c3f3a3a935d02b12193c SHA-1: 2640e78781294f136982bce2a6ec279df164308d SHA-256: fafaca5317436edd24ccd0690f2b75c4276b21dbdf9b186a7de0f0dc1f4aa932
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function. This function is designed to execute arbitrary code, which is a common technique for downloading and executing further malicious payloads. The presence of dangerous formula APIs in the Auto_Open macro indicates a high likelihood of malicious intent.

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) 6625 bytes
SHA-256: cada7f5eb3cd9417742782c62a4fdf9c7a4f5817688f032758e3c0de667f2aae
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 -  zORVhpvJbB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D157 
' 0018     26 LABEL : Cell Value, String Constant - ESuuNHoByuG len=0 
' 0018     27 LABEL : Cell Value, String Constant - fhbsuHZMSXGZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - GybSXcAZaKj len=0 
' 0018     25 LABEL : Cell Value, String Constant - hITQhGDJXJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - icWwjlGXRV len=0 
' 0018     22 LABEL : Cell Value, String Constant - kTEejsG len=0 
' 0018     27 LABEL : Cell Value, String Constant - lIThBLULJnmT len=0 
' 0018     21 LABEL : Cell Value, String Constant - mbGkRg len=0 
' 0018     26 LABEL : Cell Value, String Constant - MhcpHcmsiSo len=0 
' 0018     27 LABEL : Cell Value, String Constant - odUlHHRQCvnt len=0 
' 0018     23 LABEL : Cell Value, String Constant - onPydWOI len=0 
' 0018     26 LABEL : Cell Value, String Constant - PeNrHooTqLU len=0 
' 0018     23 LABEL : Cell Value, String Constant - pMQTOrQq len=0 
' 0018     25 LABEL : Cell Value, String Constant - TMpdEExlNf len=0 
' 0018     24 LABEL : Cell Value, String Constant - tZUadFeYZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ubJsS len=0 
' 0018     21 LABEL : Cell Value, String Constant - WFJsku len=0 
' 0018     22 LABEL : Cell Value, String Constant - WTmQnZC len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZqtzdP len=0 
' 0018     21 LABEL : Cell Value, String Constant - zUjgzM 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/ SS
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.