Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af9f0cb556289e78…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:51 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 4dca39760ed2f243f55b7e8a16992d35 SHA-1: c1710ad1b3f5f964ea9543cbf2162aeaad0ff12a SHA-256: af9f0cb556289e787034518e444d2ec4b2fc825fefe2a54b07077207a705d12f
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains a call to a dangerous function (RUN=0), suggesting it's designed to download and execute a payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6590 bytes
SHA-256: d181351d49ced35c82601b983df8ce99bb3bccae747debbf92fa78605f846f55
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HuMyMLJY
' 0018     26 LABEL : Cell Value, String Constant - apYGyNRnWRZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G130 
' 0018     23 LABEL : Cell Value, String Constant - BfFHUUyE len=0 
' 0018     25 LABEL : Cell Value, String Constant - gOCxFrmpJu len=0 
' 0018     27 LABEL : Cell Value, String Constant - kcPpgScKclhu len=0 
' 0018     26 LABEL : Cell Value, String Constant - KDEDDkfxdcE len=0 
' 0018     24 LABEL : Cell Value, String Constant - KkTurhjOT len=0 
' 0018     20 LABEL : Cell Value, String Constant - kltcK len=0 
' 0018     20 LABEL : Cell Value, String Constant - Knizd len=0 
' 0018     21 LABEL : Cell Value, String Constant - lHzMLG len=0 
' 0018     22 LABEL : Cell Value, String Constant - lmNePXx len=0 
' 0018     24 LABEL : Cell Value, String Constant - PpyKpRJuP len=0 
' 0018     26 LABEL : Cell Value, String Constant - qIPZsqqPWXW len=0 
' 0018     20 LABEL : Cell Value, String Constant - rswPM len=0 
' 0018     23 LABEL : Cell Value, String Constant - SBszovLA len=0 
' 0018     25 LABEL : Cell Value, String Constant - sTGaRkrkFD len=0 
' 0018     26 LABEL : Cell Value, String Constant - uJcdKdzRVES len=0 
' 0018     24 LABEL : Cell Value, String Constant - uLdyQeNcn len=0 
' 0018     24 LABEL : Cell Value, String Constant - VQxmpxZJK len=0 
' 0018     20 LABEL : Cell Value, String Constant - xwkzt len=0 
' 0018     25 LABEL : Cell Value, String Constant - YdgPgoRamX 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 
... (truncated)

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