Rtf.Dropper.Agent-9965975-1 RTF malware analysis — malicious · 7609034e7473869b

MALICIOUS

RTF

1.65 MB Created: 2020-07-28 13:51:00 First seen: 2020-09-15

MD5: e5b15619b70d6e96af783327dc79eda7 SHA-1: a30a260cb9c9d3193dc71d580d09656dd5c0f4e1 SHA-256: 7609034e7473869b3a5767f9543b6067998f4db68e3ba26966c115535337337f

302 Risk Score

Malware Insights

Rtf.Dropper.Agent-9965975-1 · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains multiple embedded OLE objects, with significant hex-encoded data and a detected PE header within one of these objects. ClamAV identifies this as Rtf.Dropper.Agent-9965975-1, indicating its function as a dropper. The embedded artifacts are likely the payload intended for execution.

Heuristics 9

ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
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
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
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 ~1684KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c27.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C27	257567 bytes
SHA-256: `52d82fdef8164c508e1a4bdd9c1bbfeeac1d63f198a39443627823188b6a43d7`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_STR_GETPROCADDRESS, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: kernel32.dll, shell32.dll, KERNEL32.DLL, GetProcAddress, ExitProcess
`objdata_01_off00086fe1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x86FE1	567608 bytes
SHA-256: `afe9a54a4ced7ad2b136a61223bee2097c90ca0f8ff84112cf6b6f7f76446db0`
`objdata_02_off0019f86d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19F86D	1067 bytes
SHA-256: `fa8fe86b2ae8ac8fb733730018429e3b42b47b4aa04cc07e7041e2557bf14e39`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, NOP sled

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