Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4d3506adeeb2c272…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:18 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 274c7004ee91e8a8a51be19e69cf309e SHA-1: f9d4e0aa89f54702195c33df7ba587c96929188a SHA-256: 4d3506adeeb2c2726c6b87cfa2152ecb9bdd3e5d62350b4dbfe25142289c151b
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 entry point. Heuristics indicate the use of dangerous formula APIs, suggesting the macro is designed to execute arbitrary commands or download further payloads. The obfuscated document body and truncated script content prevent a more detailed analysis of the specific actions taken.

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) 6785 bytes
SHA-256: 141516ed293120f7e4f19e405f1c40a1673c322885781cd77c6e90110be4bd2a
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 -  eyaiuhnmsp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B185 
' 0018     25 LABEL : Cell Value, String Constant - EAvfwqnorH len=0 
' 0018     21 LABEL : Cell Value, String Constant - eogRjY len=0 
' 0018     24 LABEL : Cell Value, String Constant - GfgXuuEds len=0 
' 0018     26 LABEL : Cell Value, String Constant - HpTpQJIarWG len=0 
' 0018     20 LABEL : Cell Value, String Constant - iXBNm len=0 
' 0018     25 LABEL : Cell Value, String Constant - IyvMUUaPKG len=0 
' 0018     26 LABEL : Cell Value, String Constant - jjabOFMCVFT len=0 
' 0018     27 LABEL : Cell Value, String Constant - kjVSNbxqitZh len=0 
' 0018     23 LABEL : Cell Value, String Constant - MVaLQZHM len=0 
' 0018     27 LABEL : Cell Value, String Constant - nPLwfllefaWr len=0 
' 0018     24 LABEL : Cell Value, String Constant - OyCbfqdyc len=0 
' 0018     21 LABEL : Cell Value, String Constant - PaMcnd len=0 
' 0018     21 LABEL : Cell Value, String Constant - RHsIvo len=0 
' 0018     24 LABEL : Cell Value, String Constant - RvTSjFipn len=0 
' 0018     27 LABEL : Cell Value, String Constant - toYgMxMdibgh len=0 
' 0018     20 LABEL : Cell Value, String Constant - VtlTZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - vUfdibuusOUi len=0 
' 0018     25 LABEL : Cell Value, String Constant - wQlXSFxBEm len=0 
' 0018     26 LABEL : Cell Value, String Constant - YPlIyPSzOlf len=0 
' 0018     26 LABEL : Cell Value, String Constant - zhYEXhYBFjg 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 Const
... (truncated)

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