Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5924a1069d3c8ca8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:14 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: ae2937dfd4eaf284fb5c33f88c3781a9 SHA-1: abb196176f1a4be9f7a1b3fbf070dd6fbf6d9d00 SHA-256: 5924a1069d3c8ca89f8aa4b8c44dc6e549e44c9feb668a36971f8fc507c000ab
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. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro sheet contains dangerous formula APIs, specifically the RUN function, suggesting it is designed to download and execute a secondary payload. No specific family could be identified.

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) 6672 bytes
SHA-256: c1e67789abc5588d0cbda2801def59178b3c4b76fb4c0e9e784d25cb06901a21
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 -  lBidRhLaMk
' 0018     27 LABEL : Cell Value, String Constant - aGnchtygtHCG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A140 
' 0018     23 LABEL : Cell Value, String Constant - ePImMHNq len=0 
' 0018     24 LABEL : Cell Value, String Constant - fQaAWfENV len=0 
' 0018     21 LABEL : Cell Value, String Constant - gbbPaw len=0 
' 0018     22 LABEL : Cell Value, String Constant - GHpZjoA len=0 
' 0018     25 LABEL : Cell Value, String Constant - jDHufhyQNN len=0 
' 0018     24 LABEL : Cell Value, String Constant - JrlBWOuwa len=0 
' 0018     24 LABEL : Cell Value, String Constant - lKGYNgarS len=0 
' 0018     23 LABEL : Cell Value, String Constant - nDwizvjr len=0 
' 0018     25 LABEL : Cell Value, String Constant - PPrPAlDkTG len=0 
' 0018     26 LABEL : Cell Value, String Constant - qbflIpWgixW len=0 
' 0018     25 LABEL : Cell Value, String Constant - QrhAOWlyTd len=0 
' 0018     20 LABEL : Cell Value, String Constant - ukjbE len=0 
' 0018     24 LABEL : Cell Value, String Constant - VigIqcPFK len=0 
' 0018     26 LABEL : Cell Value, String Constant - WBnsIbeJWKE len=0 
' 0018     24 LABEL : Cell Value, String Constant - xEyysXODT len=0 
' 0018     20 LABEL : Cell Value, String Constant - xitnj len=0 
' 0018     23 LABEL : Cell Value, String Constant - XkWOXvgh len=0 
' 0018     22 LABEL : Cell Value, String Constant - yHWnqdb len=0 
' 0018     24 LABEL : Cell Value, String Constant - YxUjFChbN 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
' 00
... (truncated)

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