Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0af3b1ae9d166d5d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:08 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: e7ccb347c1e960e183becdc294ae7d4e SHA-1: f768709cd2d22368055bacaad46bbda854a82c35 SHA-256: 0af3b1ae9d166d5d4cd9f5b3ae09bec375078cc04cddfda2246c0bbd14a2a487
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs further supports this. The macro sheet is likely designed to execute a malicious payload upon opening the workbook.

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) 6675 bytes
SHA-256: b2b740a0e1cea3960390054cddc2b7669480f2bd74d7906ceab0c613080a25ed
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SXPMe
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H164 
' 0018     20 LABEL : Cell Value, String Constant - AwGUc len=0 
' 0018     25 LABEL : Cell Value, String Constant - ezbjagdoFm len=0 
' 0018     20 LABEL : Cell Value, String Constant - fDyrj len=0 
' 0018     24 LABEL : Cell Value, String Constant - FglNBdWpQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - fJzgVbUvpwu len=0 
' 0018     23 LABEL : Cell Value, String Constant - GYuggEGb len=0 
' 0018     21 LABEL : Cell Value, String Constant - HbVGDe len=0 
' 0018     25 LABEL : Cell Value, String Constant - IGsexrziPF len=0 
' 0018     27 LABEL : Cell Value, String Constant - jzBoVXlsmkCo len=0 
' 0018     24 LABEL : Cell Value, String Constant - rwLDwGOvV len=0 
' 0018     24 LABEL : Cell Value, String Constant - TbziwBubB len=0 
' 0018     22 LABEL : Cell Value, String Constant - UeemQUj len=0 
' 0018     20 LABEL : Cell Value, String Constant - ukCUj len=0 
' 0018     21 LABEL : Cell Value, String Constant - vTRaTQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - vZrxtlzgRvz len=0 
' 0018     26 LABEL : Cell Value, String Constant - waTesTKzGJq len=0 
' 0018     26 LABEL : Cell Value, String Constant - XEfdikVtqwN len=0 
' 0018     20 LABEL : Cell Value, String Constant - yeynO len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZbKffguZK len=0 
' 0018     23 LABEL : Cell Value, String Constant - zSwtAxBp 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 
... (truncated)

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