Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 885400a150db8ffe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:23 Authoring application: Microsoft Excel First seen: 2021-09-18
MD5: e098208f860b2269c37184ae4c839a59 SHA-1: 8fe4867721f1923353408da38d27fad9ad81b787 SHA-256: 885400a150db8ffe502cca3e49c8a18b8f85a432cea5c4685ff7995f4e66b4a8
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 function, which is a known technique for executing malicious code upon opening the document. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific malware family could be identified from the available evidence.

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) 6649 bytes
SHA-256: 6b37ea56ed4764f929ba8efbf46c28cf8a9dfa948289cff56ee0b11389d979cd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RZAbhONA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B160 
' 0018     20 LABEL : Cell Value, String Constant - BcRPH len=0 
' 0018     21 LABEL : Cell Value, String Constant - BjgqFr len=0 
' 0018     21 LABEL : Cell Value, String Constant - dhDSuh len=0 
' 0018     24 LABEL : Cell Value, String Constant - DRcyrKuPi len=0 
' 0018     27 LABEL : Cell Value, String Constant - DUUxfCYSbLok len=0 
' 0018     20 LABEL : Cell Value, String Constant - EaJaG len=0 
' 0018     20 LABEL : Cell Value, String Constant - hDvZz len=0 
' 0018     27 LABEL : Cell Value, String Constant - HOtKFxGGlnSJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - jrnxRmN len=0 
' 0018     22 LABEL : Cell Value, String Constant - jwhiqGO len=0 
' 0018     26 LABEL : Cell Value, String Constant - kEXobXJKAPn len=0 
' 0018     21 LABEL : Cell Value, String Constant - kNlUzM len=0 
' 0018     26 LABEL : Cell Value, String Constant - KnPkZJZzqio len=0 
' 0018     21 LABEL : Cell Value, String Constant - lzxeRJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - mKSJshUCxdlG len=0 
' 0018     21 LABEL : Cell Value, String Constant - MVfqdW len=0 
' 0018     27 LABEL : Cell Value, String Constant - QvEExPARjDwh len=0 
' 0018     26 LABEL : Cell Value, String Constant - ScbTgunPkdX len=0 
' 0018     21 LABEL : Cell Value, String Constant - TSjbwl len=0 
' 0018     24 LABEL : Cell Value, String Constant - tXxzDJMTh 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     10 
... (truncated)

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