Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f96118d4208ae6aa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:38 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: 6ffa2d9b4ede9f702fd0ae40363638cc SHA-1: bcc0cdf2d62961f303d87e63b4449cc4392ca770 SHA-256: f96118d4208ae6aa9ba248f7fba12f7bd7ed26bee97ad631216ef3f4c281046c
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a critical finding. This indicates the file is designed to execute arbitrary code when opened. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a second-stage payload, although no specific URLs or commands were extracted.

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) 6745 bytes
SHA-256: f6cfaf4c0af79a137d975204d9cc5a391084c2211079b36652e645601b97786c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hRZOEHHJmDZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A178 
' 0018     27 LABEL : Cell Value, String Constant - eAIAlNNoyINM len=0 
' 0018     21 LABEL : Cell Value, String Constant - fSgdYn len=0 
' 0018     23 LABEL : Cell Value, String Constant - hiVElWHl len=0 
' 0018     26 LABEL : Cell Value, String Constant - hkgqvzmQWAZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HqTUeKsmZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jwsvASlACHp len=0 
' 0018     27 LABEL : Cell Value, String Constant - KfmPWgNVCjOw len=0 
' 0018     24 LABEL : Cell Value, String Constant - KfsLZLLWZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mDsfb len=0 
' 0018     22 LABEL : Cell Value, String Constant - Mvstwrm len=0 
' 0018     20 LABEL : Cell Value, String Constant - MWcUI len=0 
' 0018     25 LABEL : Cell Value, String Constant - OBRRuezDiz len=0 
' 0018     26 LABEL : Cell Value, String Constant - PlKGzcbeqcd len=0 
' 0018     20 LABEL : Cell Value, String Constant - pRMDl len=0 
' 0018     20 LABEL : Cell Value, String Constant - SasWc len=0 
' 0018     25 LABEL : Cell Value, String Constant - sNadSKVYeK len=0 
' 0018     27 LABEL : Cell Value, String Constant - tkherurIRVpp len=0 
' 0018     20 LABEL : Cell Value, String Constant - VgkxY len=0 
' 0018     27 LABEL : Cell Value, String Constant - WfjftEhIcSFy len=0 
' 0018     26 LABEL : Cell Value, String Constant - ysOcCuGzHRj 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
... (truncated)

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