Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bc08d3a6eb2c08b6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:07 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: e080638dbb09422d0330b8a05b6f06e1 SHA-1: f98a2125ee57d4ebfbb2e9fdea94a33a1385f04c SHA-256: bc08d3a6eb2c08b6240b12948a08dfff45140d8e7fa195f76e2c9eadbed2504d
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. The macro sheet is likely designed to download and execute a second-stage payload.

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) 6857 bytes
SHA-256: 297fee63ae1749efb906a86783510365232a42a048a7c7ce0a375b9d370a7661
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 -  JxuHsvfjUz
' 0018     27 LABEL : Cell Value, String Constant - aEGiOyBctGms len=0 
' 0018     27 LABEL : Cell Value, String Constant - aJnMJvudaOhg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B170 
' 0018     20 LABEL : Cell Value, String Constant - DztvJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - FEuGYRtb len=0 
' 0018     24 LABEL : Cell Value, String Constant - GBdJhHTwQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - GeoFlDXCCisg len=0 
' 0018     22 LABEL : Cell Value, String Constant - GGDsjtd len=0 
' 0018     23 LABEL : Cell Value, String Constant - hdigVyck len=0 
' 0018     25 LABEL : Cell Value, String Constant - hHQKmujsDU len=0 
' 0018     26 LABEL : Cell Value, String Constant - HTzhGbRMpcf len=0 
' 0018     21 LABEL : Cell Value, String Constant - HyhQoI len=0 
' 0018     21 LABEL : Cell Value, String Constant - iDnfkq len=0 
' 0018     27 LABEL : Cell Value, String Constant - KzzCyLNGFXVt len=0 
' 0018     21 LABEL : Cell Value, String Constant - lycVHx len=0 
' 0018     27 LABEL : Cell Value, String Constant - OWNzKtWbCaFN len=0 
' 0018     26 LABEL : Cell Value, String Constant - sYWNCIEkiIy len=0 
' 0018     25 LABEL : Cell Value, String Constant - TRlDbVUevj len=0 
' 0018     20 LABEL : Cell Value, String Constant - tRulI len=0 
' 0018     20 LABEL : Cell Value, String Constant - WVjlS len=0 
' 0018     27 LABEL : Cell Value, String Constant - zIzthKNIKdkT 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/ S
... (truncated)

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