Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d2af28ba15c4de6b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:29 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: ca5fd535de1378c49972714e4d870426 SHA-1: 6ef854855cfe5471ee40bca2e847cc11524739b6 SHA-256: d2af28ba15c4de6b16064ab6703e3fd28a0a7724cd98060668027a19b69b7863
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 sheet that contains an Auto_Open defined name, indicating that it is designed to execute code automatically when the workbook is opened. The presence of dangerous formula APIs in the Auto_Open macro suggests malicious intent, likely to download and execute a second-stage payload. No specific family could be identified from the available evidence.

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) 6420 bytes
SHA-256: 6ab243722a62e45227bf4de691db8f1f528a832cfe546c7037bd799efca4abfd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eQa
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H151 
' 0018     21 LABEL : Cell Value, String Constant - aveacv len=0 
' 0018     25 LABEL : Cell Value, String Constant - bpWKRRrtJT len=0 
' 0018     23 LABEL : Cell Value, String Constant - bwhMwukd len=0 
' 0018     22 LABEL : Cell Value, String Constant - dawqQcW len=0 
' 0018     20 LABEL : Cell Value, String Constant - DSOlF len=0 
' 0018     25 LABEL : Cell Value, String Constant - eKOtwQCiVL len=0 
' 0018     25 LABEL : Cell Value, String Constant - eZUdAcOhfI len=0 
' 0018     21 LABEL : Cell Value, String Constant - gUMsqq len=0 
' 0018     20 LABEL : Cell Value, String Constant - jkRsU len=0 
' 0018     21 LABEL : Cell Value, String Constant - jYJYWi len=0 
' 0018     20 LABEL : Cell Value, String Constant - ldYPW len=0 
' 0018     27 LABEL : Cell Value, String Constant - mBunyuJOGgyf len=0 
' 0018     21 LABEL : Cell Value, String Constant - MCUsib len=0 
' 0018     27 LABEL : Cell Value, String Constant - mqjunxdadVZa len=0 
' 0018     27 LABEL : Cell Value, String Constant - mwtRfkaFPfaI len=0 
' 0018     21 LABEL : Cell Value, String Constant - PHyHTT len=0 
' 0018     23 LABEL : Cell Value, String Constant - uHinnTOY len=0 
' 0018     20 LABEL : Cell Value, String Constant - VaoFB len=0 
' 0018     27 LABEL : Cell Value, String Constant - WZoUzQTfzxLC len=0 
' 0018     27 LABEL : Cell Value, String Constant - YHZHLoVIjnSG 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     10 LABELS
... (truncated)

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