Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6f3c0dad7facd46b…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:12 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: 4b9e68c654814b6160ef1449212b9b86 SHA-1: f6ee3b5a65cb62da38487b011041e939db58af96 SHA-256: 6f3c0dad7facd46b2eb23c254625e90088123d5741f8e123e46c2080432dba04
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 finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code. This points to a macro-based attack designed to run malicious commands.

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) 6430 bytes
SHA-256: 955ea1378efe29aba09352d8f7436ebab8a82022cdeef9be317fb1d2620958d2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kAYm
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B185 
' 0018     24 LABEL : Cell Value, String Constant - btOSfQWtt len=0 
' 0018     20 LABEL : Cell Value, String Constant - EsRar len=0 
' 0018     26 LABEL : Cell Value, String Constant - FkBEgblCLCk len=0 
' 0018     23 LABEL : Cell Value, String Constant - iwfkUieJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - JmKCj len=0 
' 0018     26 LABEL : Cell Value, String Constant - joAzRXHnIVT len=0 
' 0018     21 LABEL : Cell Value, String Constant - JyLGca len=0 
' 0018     25 LABEL : Cell Value, String Constant - MhWwwUpEft len=0 
' 0018     21 LABEL : Cell Value, String Constant - MXhaWM len=0 
' 0018     21 LABEL : Cell Value, String Constant - NyaoMB len=0 
' 0018     25 LABEL : Cell Value, String Constant - pPvpNGGFsc len=0 
' 0018     27 LABEL : Cell Value, String Constant - QVqfpvzKeeks len=0 
' 0018     25 LABEL : Cell Value, String Constant - saYIqhGRfu len=0 
' 0018     27 LABEL : Cell Value, String Constant - tAfEURYdnpxK len=0 
' 0018     27 LABEL : Cell Value, String Constant - TCVHZASdyipY len=0 
' 0018     21 LABEL : Cell Value, String Constant - UUYWQG len=0 
' 0018     21 LABEL : Cell Value, String Constant - UZZDto len=0 
' 0018     23 LABEL : Cell Value, String Constant - WcAAlLJH len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZlJyyDld len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZPVHebFByv 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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