Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f3f2bccd7d57a670…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:41:41 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: d27ec4a2c40ae5668059ab6837a4fe20 SHA-1: 278b3c04c3d268321071a8b7f1c3235f22975e47 SHA-256: f3f2bccd7d57a670425b5f0ad5a07153ebd809398c0a8381f316f46c51e5532d
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs like 'RUN' suggests the macro is designed to download and execute a secondary payload, a common technique for initial access and further compromise.

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) 6720 bytes
SHA-256: 6e4310929dd99eea4c8af955f15085a55e40f843ecd64dc050f41d85d739cf9d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aQmNjKD
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G142 
' 0018     27 LABEL : Cell Value, String Constant - bMERdZmeaRoN len=0 
' 0018     27 LABEL : Cell Value, String Constant - DEgcOcTGekJB len=0 
' 0018     25 LABEL : Cell Value, String Constant - EAeYvDclAi len=0 
' 0018     24 LABEL : Cell Value, String Constant - eNmecKfhy len=0 
' 0018     27 LABEL : Cell Value, String Constant - FLovZGtfcoNO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ihhKinb len=0 
' 0018     21 LABEL : Cell Value, String Constant - IMJaNb len=0 
' 0018     25 LABEL : Cell Value, String Constant - iuPEsSqKoj len=0 
' 0018     21 LABEL : Cell Value, String Constant - iZvIqf len=0 
' 0018     21 LABEL : Cell Value, String Constant - kXTnpV len=0 
' 0018     24 LABEL : Cell Value, String Constant - LPtsWPqNg len=0 
' 0018     26 LABEL : Cell Value, String Constant - pCgFyzPnFNo len=0 
' 0018     25 LABEL : Cell Value, String Constant - QhePppoLFY len=0 
' 0018     21 LABEL : Cell Value, String Constant - QszAYF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ULWvCVox len=0 
' 0018     22 LABEL : Cell Value, String Constant - VxHPeEi len=0 
' 0018     22 LABEL : Cell Value, String Constant - WhUJQPX len=0 
' 0018     24 LABEL : Cell Value, String Constant - WYjZUbEnv len=0 
' 0018     27 LABEL : Cell Value, String Constant - XMmChhzsUfGV len=0 
' 0018     24 LABEL : Cell Value, String Constant - ymbMUFanU 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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