Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eafc01be092eb06d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:55 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 35be5e4a7f5289a855139413c66207af SHA-1: 824fe27085e686a80e6344d57fabb04820b92346 SHA-256: eafc01be092eb06d643a835627fbaf1c9f8e57aad472077333b7ce42389dd2d8
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 suggests malicious intent. This setup is commonly used to download and execute additional malicious content.

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) 6570 bytes
SHA-256: 976dc506f58822d655591e42218c2d51eccfde9ab32ba492168659d18e77462e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UbMczjdSr
' 0018     21 LABEL : Cell Value, String Constant - ACUFry len=0 
' 0018     27 LABEL : Cell Value, String Constant - aPGmKwKEuASj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F176 
' 0018     20 LABEL : Cell Value, String Constant - DhYbc len=0 
' 0018     20 LABEL : Cell Value, String Constant - DPoex len=0 
' 0018     20 LABEL : Cell Value, String Constant - fDSMZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - fTgNwFaDrDuc len=0 
' 0018     22 LABEL : Cell Value, String Constant - GgJaaTl len=0 
' 0018     23 LABEL : Cell Value, String Constant - hyeOXWgR len=0 
' 0018     25 LABEL : Cell Value, String Constant - lfBKmUaSpv len=0 
' 0018     26 LABEL : Cell Value, String Constant - LkXQToyxSzh len=0 
' 0018     26 LABEL : Cell Value, String Constant - mnGSiVgekQv len=0 
' 0018     24 LABEL : Cell Value, String Constant - NeOKtiLMK len=0 
' 0018     26 LABEL : Cell Value, String Constant - PMZfdvDgWSe len=0 
' 0018     26 LABEL : Cell Value, String Constant - rNcPfSXLVaN len=0 
' 0018     20 LABEL : Cell Value, String Constant - SsyPN len=0 
' 0018     23 LABEL : Cell Value, String Constant - SVjXHVtj len=0 
' 0018     21 LABEL : Cell Value, String Constant - UDvpWk len=0 
' 0018     22 LABEL : Cell Value, String Constant - VmXZaKg len=0 
' 0018     25 LABEL : Cell Value, String Constant - wXpnfUtjmk len=0 
' 0018     26 LABEL : Cell Value, String Constant - YWLFWbpuDsz 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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