RTF malware analysis — malicious · 40c0532f5255e633

MALICIOUS

RTF

66.3 KB Authoring application: riched20 6.3.9600 First seen: 2020-05-25

MD5: 44bf5f6b4b4af2224382a09377e18214 SHA-1: 4cd50b302d2691746b50fd847bb66844e65fb22d SHA-256: 40c0532f5255e633a13dc4e5db9dda1be5a3733a152793e2d893ab8207c6acd6

402 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded Equation Editor OLE object that exploits CVE-2017-11882. This exploit is known to be used to execute arbitrary code, and in this case, it likely downloads and executes a second-stage payload from the URL http://steamer10theatre.org/wp-admin/js/ehe.exe. The presence of shellcode candidate regions in the extracted objdata further supports this. The ClamAV detection as Doc.Dropper.Agent-6497106-0 indicates a known dropper functionality.

Heuristics 10

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Doc.Dropper.Agent-6497106-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6497106-0
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
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.
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 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://steamer10theatre.org/wp-admin/js/ehe.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000fe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFE	33458 bytes
SHA-256: `ad94f98d824fd21eff8c9c1543c7da6fd1f727601dd661ce040feeaf9a92b804`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: NOP sled

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