Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8e2038aabd9fdac4…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:09 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 21066cb1c1f1a54e1f816b7adecb8558 SHA-1: d33e81d5bdf20c4b247b8e070a6cf45651c6d784 SHA-256: 8e2038aabd9fdac43417e772e35062bdcc7719b7ad130a2b0f88d4a17ba87f64
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 sheet that contains an Auto_Open defined name, indicating that it will execute code automatically when opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute a payload. While no specific URLs or hashes were extracted, the Auto_Open functionality is a strong indicator of malicious intent, likely to download and execute a second-stage payload.

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) 6784 bytes
SHA-256: 8e4887b57e6739014fa1e022305ed7be53163106860892ea83a22663716de866
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 -  eZoSRHuk
' 0018     25 LABEL : Cell Value, String Constant - AQsVwafBkv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B129 
' 0018     27 LABEL : Cell Value, String Constant - bffGwAgviwMM len=0 
' 0018     22 LABEL : Cell Value, String Constant - dhuUdGD len=0 
' 0018     26 LABEL : Cell Value, String Constant - DPxPwxoxOtl len=0 
' 0018     24 LABEL : Cell Value, String Constant - fabOkPDBX len=0 
' 0018     22 LABEL : Cell Value, String Constant - jFuNzPU len=0 
' 0018     24 LABEL : Cell Value, String Constant - jRBlvmMEF len=0 
' 0018     20 LABEL : Cell Value, String Constant - KUDYh len=0 
' 0018     25 LABEL : Cell Value, String Constant - LIfwGdLymT len=0 
' 0018     21 LABEL : Cell Value, String Constant - mARRMM len=0 
' 0018     23 LABEL : Cell Value, String Constant - mXOrAYhZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NQoehma len=0 
' 0018     20 LABEL : Cell Value, String Constant - qxipP len=0 
' 0018     24 LABEL : Cell Value, String Constant - uIsihJgWB len=0 
' 0018     20 LABEL : Cell Value, String Constant - VbGGC len=0 
' 0018     26 LABEL : Cell Value, String Constant - XhelMqKEiCo len=0 
' 0018     24 LABEL : Cell Value, String Constant - YmmGQRYvG len=0 
' 0018     25 LABEL : Cell Value, String Constant - yTQuckmiSh len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZDygY len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZoiyvidT 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 L
... (truncated)

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