Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 609bbdd7fc084af7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:37:44 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 6a33ea4a3c2089d787d4a46ed4d8d74a SHA-1: 35f287f43d70e95bc0a7ef7abf36ea30861f1791 SHA-256: 609bbdd7fc084af7cf036f48dfecac6268af83a073d1d3a24f58bea1c08f4cf7
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 defined name, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, suggesting it's designed to run arbitrary commands or download further payloads.

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) 6691 bytes
SHA-256: 0ef5326ecd0c8da7de45ca3ff5bbb5aeca1071d142a629ef5c5e156dae6b7a94
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YJqVmd
' 0018     23 LABEL : Cell Value, String Constant - amKQMWOl len=0 
' 0018     24 LABEL : Cell Value, String Constant - AUbgSRhlO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C135 
' 0018     23 LABEL : Cell Value, String Constant - BUcXNxnU len=0 
' 0018     23 LABEL : Cell Value, String Constant - EJwfXBAy len=0 
' 0018     25 LABEL : Cell Value, String Constant - FrltWAcDAU len=0 
' 0018     25 LABEL : Cell Value, String Constant - FvDwKYbcrD len=0 
' 0018     26 LABEL : Cell Value, String Constant - FVgbzliJAGw len=0 
' 0018     22 LABEL : Cell Value, String Constant - gmZnpIs len=0 
' 0018     27 LABEL : Cell Value, String Constant - MayrzEXtCUaG len=0 
' 0018     25 LABEL : Cell Value, String Constant - niHqoDpefn len=0 
' 0018     21 LABEL : Cell Value, String Constant - OrprAc len=0 
' 0018     20 LABEL : Cell Value, String Constant - PvOnC len=0 
' 0018     22 LABEL : Cell Value, String Constant - pYOubPO len=0 
' 0018     27 LABEL : Cell Value, String Constant - QZAXHDNWopXl len=0 
' 0018     25 LABEL : Cell Value, String Constant - tuSofMDuGd len=0 
' 0018     25 LABEL : Cell Value, String Constant - uaJKNTPZri len=0 
' 0018     24 LABEL : Cell Value, String Constant - vdOepkzrl len=0 
' 0018     20 LABEL : Cell Value, String Constant - VkPSD len=0 
' 0018     23 LABEL : Cell Value, String Constant - yZZDRNrv len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZFCOgUFpIIR 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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