Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1d69f1eb7a60352…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:45 Authoring application: Microsoft Excel First seen: 2021-10-05
MD5: bbfaa70d6bf66aa45ce67d7ec65966a9 SHA-1: 020e0be1e596fcb0c861e1e696ee3a3f8a26c137 SHA-256: c1d69f1eb7a60352dc53a46299e76c452355e84af4350c84ca0ca334c385d8b7
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-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to perform harmful actions. No specific IOCs like URLs or hashes were extracted, but the technique itself is highly indicative of malicious intent.

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) 6815 bytes
SHA-256: 2c5edb8c73a66a72c46320c2971c9580aa63c6813a30a0196fa0abbb39092498
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 -  MltKSAgnB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D167 
' 0018     25 LABEL : Cell Value, String Constant - baZFXdcvzj len=0 
' 0018     24 LABEL : Cell Value, String Constant - bncPEKdJq len=0 
' 0018     26 LABEL : Cell Value, String Constant - BRLbyaMTOQI len=0 
' 0018     27 LABEL : Cell Value, String Constant - evfNVavQguzc len=0 
' 0018     23 LABEL : Cell Value, String Constant - hUFJlbOh len=0 
' 0018     26 LABEL : Cell Value, String Constant - iYtrSfKlZEb len=0 
' 0018     20 LABEL : Cell Value, String Constant - KuFwB len=0 
' 0018     22 LABEL : Cell Value, String Constant - mjWgLnf len=0 
' 0018     26 LABEL : Cell Value, String Constant - MWimcCJiHNz len=0 
' 0018     21 LABEL : Cell Value, String Constant - nayYsc len=0 
' 0018     27 LABEL : Cell Value, String Constant - NQfCugObSqoF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ovMnmZLW len=0 
' 0018     21 LABEL : Cell Value, String Constant - OXgjBR len=0 
' 0018     20 LABEL : Cell Value, String Constant - oYbhl len=0 
' 0018     26 LABEL : Cell Value, String Constant - SgVWDDonIKM len=0 
' 0018     21 LABEL : Cell Value, String Constant - ShnxbM len=0 
' 0018     24 LABEL : Cell Value, String Constant - UVottmEmA len=0 
' 0018     25 LABEL : Cell Value, String Constant - VAXDXSKYVO len=0 
' 0018     26 LABEL : Cell Value, String Constant - WyHgsPEVKFm len=0 
' 0018     27 LABEL : Cell Value, String Constant - XXxVVeOQpDGi 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/ S
... (truncated)

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