Ardamax RTF malware analysis — malicious · 043b160121ad41f8

MALICIOUS

RTF

1.15 MB Authoring application: Msftedit 5.41.15.1515

MD5: 4b7943038a5811108d8a54b05c87e4df SHA-1: aa57a7e60cf52d05162319855a253f950f4a457d SHA-256: 043b160121ad41f864d6eccbcdfd1708675aba7d6a349bdf615d901bb30efaf9

302 Risk Score

Malware Insights

Ardamax · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains a high amount of hex-encoded data within an OLE object, which includes a PE header. ClamAV signatures identify this as Win.Dropper.Ardamax-6856679-0, indicating it's a dropper designed to deliver a secondary payload. The presence of the PE header within the OLE object strongly suggests an attempt to execute malicious code upon opening.

Heuristics 8

PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Win.Dropper.Ardamax-6856679-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.Ardamax-6856679-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1198KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000f9.bin` `58e43ce52816284aff48681147839ae199f456374028f8b86cfcf82b2f21e484`	rtf-objdata-decoded	RTF \objdata at offset 0xF9	584115 bytes
Detection ClamAV: Win.Dropper.Ardamax-6856679-0 Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.

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