Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7e6993437b6c1775…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:45 Authoring application: Microsoft Excel First seen: 2021-10-07
MD5: a408ee71eebd74fb19f898e4059231e2 SHA-1: 3918c4f8f5f6850d44b848da7f1f6fb2c2012167 SHA-256: 7e6993437b6c17759bd6f9866c59768e4410704d29fc58f5619e172788cf4c4e
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 defined name, which is a common technique for executing malicious code upon opening the document. The macro sheet also contains dangerous formula APIs, suggesting it's designed to perform harmful actions. No specific IOCs like URLs or hashes were extracted, but the technique itself is highly suspicious.

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) 6678 bytes
SHA-256: b3682baf68a818bd02bc01cb2308a2345d1bfd032e705371dbd8cc521ae2a8fd
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 -  aLPGXer
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B150 
' 0018     25 LABEL : Cell Value, String Constant - FJXmUMNcCS len=0 
' 0018     21 LABEL : Cell Value, String Constant - fKuYuR len=0 
' 0018     26 LABEL : Cell Value, String Constant - gZWgVYMmzTB len=0 
' 0018     23 LABEL : Cell Value, String Constant - HcWvFIkO len=0 
' 0018     20 LABEL : Cell Value, String Constant - iFnan len=0 
' 0018     20 LABEL : Cell Value, String Constant - kCMJd len=0 
' 0018     27 LABEL : Cell Value, String Constant - MwEEYVaTUIiL len=0 
' 0018     22 LABEL : Cell Value, String Constant - nwmBrQq len=0 
' 0018     25 LABEL : Cell Value, String Constant - NwQMgOSows len=0 
' 0018     27 LABEL : Cell Value, String Constant - qEkCHrPLiolh len=0 
' 0018     23 LABEL : Cell Value, String Constant - qgUjejdr len=0 
' 0018     21 LABEL : Cell Value, String Constant - qlfPco len=0 
' 0018     22 LABEL : Cell Value, String Constant - TLcqtKh len=0 
' 0018     22 LABEL : Cell Value, String Constant - tUkWqoz len=0 
' 0018     21 LABEL : Cell Value, String Constant - vpRhXV len=0 
' 0018     21 LABEL : Cell Value, String Constant - VXQezQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - wnNrWazS len=0 
' 0018     23 LABEL : Cell Value, String Constant - xlvxnIfG len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZJGntQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - zkKOopRdzX 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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