Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b5b081f44c34536…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:00 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 5e091ad635b7f467f04e291dee926bc5 SHA-1: 20c3749b2abb0ceb8d39b052b7222e612b161837 SHA-256: 7b5b081f44c345368356eaf9bc397bbc15012b46222b523c09005cf5a8c8aff5
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 automatic execution upon opening. Heuristics indicate the use of dangerous formula APIs, specifically the RUN function, which is commonly used to execute arbitrary code or download additional payloads. The presence of an Auto_Open macro strongly suggests an attempt to execute malicious code, likely for initial execution or to download 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) 6597 bytes
SHA-256: 7a19d97bae5727c1371cdf4d45906f87f0134d3f897daa38699660a4a372d666
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 -  MvhKUXqqf
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F170 
' 0018     22 LABEL : Cell Value, String Constant - clsOlHF len=0 
' 0018     27 LABEL : Cell Value, String Constant - gnpZkICnEWRD len=0 
' 0018     26 LABEL : Cell Value, String Constant - IYguKycGFSg len=0 
' 0018     24 LABEL : Cell Value, String Constant - mBkPJVnGP len=0 
' 0018     21 LABEL : Cell Value, String Constant - MTaIdv len=0 
' 0018     21 LABEL : Cell Value, String Constant - nnwgyK len=0 
' 0018     21 LABEL : Cell Value, String Constant - pkgnxX len=0 
' 0018     20 LABEL : Cell Value, String Constant - qHWjr len=0 
' 0018     24 LABEL : Cell Value, String Constant - QsfwGghBN len=0 
' 0018     22 LABEL : Cell Value, String Constant - SDEenjJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - soYVfRuqlJyJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - VgAfCoIDh len=0 
' 0018     24 LABEL : Cell Value, String Constant - WdXsOvbLV len=0 
' 0018     20 LABEL : Cell Value, String Constant - wmilV len=0 
' 0018     23 LABEL : Cell Value, String Constant - xrxSrzWT len=0 
' 0018     21 LABEL : Cell Value, String Constant - xtHYfh len=0 
' 0018     23 LABEL : Cell Value, String Constant - ydgulZaf len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZLjLzHIocJB len=0 
' 0018     20 LABEL : Cell Value, String Constant - zlvAB len=0 
' 0018     20 LABEL : Cell Value, String Constant - zLVEl 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 LABELSS
... (truncated)

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