Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e6a20e435ffb963…

MALICIOUS

Office (OLE)

118.5 KB Created: 2015-03-16 02:45:00 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 69e91b8d446c1d5368526f1a5f0ec4a7 SHA-1: 531d04f9725c4b3dccd106a63753294fbacc53a3 SHA-256: 0e6a20e435ffb9636aff5b2ac6a0f7426618eb006d0050d7f4718ba8c9a07c5e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro, which is a common technique for executing malicious code upon opening. Heuristics indicate the use of dangerous formula APIs within the macro, and ClamAV detection confirms it is a known dropper. The document body displays a protection message to lure users into enabling content, facilitating macro execution.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-8396004-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8396004-0
  • 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) 57951 bytes
SHA-256: 40442eaa48d44912f6178dfeb345e5af2c2767a7f1d4aa295fb28ce32408a4f2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     26 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WRQyIMLR1dK6kS8qq
' 0018     21 LABEL : Cell Value, String Constant - AGyxHH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!BE54903 
' 0018     21 LABEL : Cell Value, String Constant - BFGWNM len=0 
' 0018     21 LABEL : Cell Value, String Constant - bKVYRG len=0 
' 0018     20 LABEL : Cell Value, String Constant - bzLRN len=0 
' 0018     19 LABEL : Cell Value, String Constant - cYQr len=0 
' 0018     19 LABEL : Cell Value, String Constant - dMwD len=0 
' 0018     18 LABEL : Cell Value, String Constant - DMY len=0 
' 0018     21 LABEL : Cell Value, String Constant - dvDwFm len=0 
' 0018     21 LABEL : Cell Value, String Constant - dvjhFg len=0 
' 0018     20 LABEL : Cell Value, String Constant - DVMTm len=0 
' 0018     19 LABEL : Cell Value, String Constant - DZOZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - eEuOOh len=0 
' 0018     21 LABEL : Cell Value, String Constant - eFkIHm len=0 
' 0018     18 LABEL : Cell Value, String Constant - eNQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - EOmwfJ len=0 
' 0018     34 LABEL : Cell Value, String Constant -          hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00D\x8ec\x8e\xe4\x00\xe4\x00'
' 0018     18 LABEL : Cell Value, String Constant - EZM len=0 
' 0018     18 LABEL : Cell Value, String Constant - ezY len=0 
' 0018     18 LABEL : Cell Value, String Constant - FJD len=0 
' 0018     18 LABEL : Cell Value, String Constant - FLy len=0 
' 0018     18 LABEL : Cell Value, String Constant - FsP len=0 
' 0018     19 LABEL : Cell Value, String Constant - fwnh len=0 
' 0018     21 LABEL : Cell Value, String Constant - GYKivH len=0 
' 0018     27 LABEL : Cell Value, String Constant - HFlxK hidden len=7 ptgRef3d  Sheet!BE54903 
' 0018     19 LABEL : Cell Value, String Constant - HuAm len=0 
' 0018     18 LABEL : Cell Value, String Constant - Ifl len=0 
' 0018     19 LABEL : Cell Value, String Constant - IozF len=0 
' 0018     18 LABEL : Cell Value, String Constant - iQC len=0 
' 0018     20 LABEL : Cell Value, String Constant - Irarj len=0 
' 0018     19 LABEL : Cell Value, String Constant - ISIF len=0 
' 0018     21 LABEL : Cell Value, String Constant - IZhQYq len=0 
' 0018     20 LABEL : Cell Value, String Constant - JihUb len=0 
' 0018     36 LABEL : Cell Value, String Constant -            hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xa1r\xc1rg\x00g\x00'
' 0018     21 LABEL : Cell Value, String Constant - jxLSdK len=0 
' 0018     18 LABEL : Cell Value, String Constant - KlL len=0 
' 0018     20 LABEL : Cell Value, String Constant - kpzpt len=0 
' 0018     21 LABEL : Cell Value, String Constant - KtQNul len=0 
' 0018     21 LABEL : Cell Value, String Constant - ktvuds len=0 
' 0018     20 LABEL : Cell Value, String Constant - LFdhd len=0 
' 0018     18 LABEL : Cell Value, String Constant - lGz len=0 
' 0018     36 LABEL : Cell Value, String Constant -            hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00ay\xb1y\x91\x00\x91\x00'
' 0018     21 LABEL : Cell Value, String Constant - MJKtrB len=0 
' 0018     19 LABEL : Cell Value, String Constant - mKBC len=0 
' 0018     21 LABEL : Cell Value, String Constant - MqVLPd len=0 
' 0018     18 LABEL : Cell Value, String Constant - MsK len=0 
' 0018     19 LABEL : Cell Value, String Constant - NpWB len=0 
' 0018     20 LABEL : Cell Value, String Constant - NXqPo len=0 
' 0018     18 LABEL : Cell Value, String Constant - oOm len=0 
' 0018     19 LABEL : Cell Value, String Constant - PjGY len=0 
' 0018     18 LABEL : Cell Value, String Constant - ptE len=0 
' 0018     21 LABEL : Cell Value, String Constant - PWRYtV len=0 
' 0018     18 LABEL : Cell Value, String Constant - qEA len=0 
' 0018     21 LABEL : Cell Value, String Constan
... (truncated)

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