Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1146cfb284434fde…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:11 Authoring application: Microsoft Excel First seen: 2021-10-01
MD5: fc9f82f841dd395ca341a79f9e9b62f9 SHA-1: 7a0760962caa743809396ce8ed3152b153d0fc33 SHA-256: 1146cfb284434fdea3b60fb08fe1da1102ef258588e180beeee541e130084996
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is known to be used for executing malicious code, often to download and run further payloads. The presence of dangerous formula APIs like RUN in the Auto_Open macro strongly indicates malicious intent. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro 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) 6563 bytes
SHA-256: c8e86f495c30de252c575c12efc7a06bc3be365db0f5e43a809eaf119d1341af
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bTGuqu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I165 
' 0018     23 LABEL : Cell Value, String Constant - bPRimzBt len=0 
' 0018     24 LABEL : Cell Value, String Constant - fEFNYNQFR len=0 
' 0018     20 LABEL : Cell Value, String Constant - FsfGs len=0 
' 0018     24 LABEL : Cell Value, String Constant - JYKLxqrnC len=0 
' 0018     27 LABEL : Cell Value, String Constant - KXpEQBfnNHrD len=0 
' 0018     27 LABEL : Cell Value, String Constant - lOGqlVsaGbwA len=0 
' 0018     22 LABEL : Cell Value, String Constant - mUFWQzR len=0 
' 0018     22 LABEL : Cell Value, String Constant - QAPKqfT len=0 
' 0018     25 LABEL : Cell Value, String Constant - qUYngpYNzw len=0 
' 0018     24 LABEL : Cell Value, String Constant - TamdfXzKA len=0 
' 0018     24 LABEL : Cell Value, String Constant - UYjmMHaaB len=0 
' 0018     27 LABEL : Cell Value, String Constant - vZHTtWKDKZiw len=0 
' 0018     25 LABEL : Cell Value, String Constant - wjYkTqikPT len=0 
' 0018     21 LABEL : Cell Value, String Constant - wptiMm len=0 
' 0018     23 LABEL : Cell Value, String Constant - xXtcHcVb len=0 
' 0018     27 LABEL : Cell Value, String Constant - YkLuapYuJwRw len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZadshiHlr len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZbDzEsZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - zDMzpckcZD len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZZTRHV 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
' 0
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.