Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f6ac9089cd6f665f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:49 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 195179fa1cc770396b34249b87503f63 SHA-1: c54d1639dba9f44a41ab0a22c2446a522a751524 SHA-256: f6ac9089cd6f665f5e28bc80e87dc109de083f5f3105c8ad314206577551d5a6
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 indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not visible, the Auto_Open function strongly implies the execution of a second-stage downloader or exploit.

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) 6766 bytes
SHA-256: 82cad7abd80eed442b86492836dae847a9610d90b8abb3c411c087f6a7d1b80a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AuklfPr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E132 
' 0018     21 LABEL : Cell Value, String Constant - BeMZqR len=0 
' 0018     20 LABEL : Cell Value, String Constant - bhtXR len=0 
' 0018     26 LABEL : Cell Value, String Constant - dfbfzEBFUpm len=0 
' 0018     24 LABEL : Cell Value, String Constant - DOYwMeMiV len=0 
' 0018     24 LABEL : Cell Value, String Constant - GXQyViKrC len=0 
' 0018     26 LABEL : Cell Value, String Constant - HCoPxTjbQST len=0 
' 0018     22 LABEL : Cell Value, String Constant - HfNRneY len=0 
' 0018     23 LABEL : Cell Value, String Constant - HFwBZbQr len=0 
' 0018     25 LABEL : Cell Value, String Constant - HTklEmamIA len=0 
' 0018     20 LABEL : Cell Value, String Constant - JxiUk len=0 
' 0018     26 LABEL : Cell Value, String Constant - KOgfnFWrTnJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - KXtyshdZUepD len=0 
' 0018     20 LABEL : Cell Value, String Constant - MxqrB len=0 
' 0018     23 LABEL : Cell Value, String Constant - PkNGmMBO len=0 
' 0018     22 LABEL : Cell Value, String Constant - pwdAQCc len=0 
' 0018     25 LABEL : Cell Value, String Constant - tRSMbAxfek len=0 
' 0018     20 LABEL : Cell Value, String Constant - UbKyK len=0 
' 0018     27 LABEL : Cell Value, String Constant - uDMUIznXvnfs len=0 
' 0018     23 LABEL : Cell Value, String Constant - UysgOYZP len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZzjfSYnOuYmy 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  
... (truncated)

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