RTF / .DOC malware analysis — malicious · 06aa198c6c7505c0

MALICIOUS

RTF / .DOC

1.21 MB

MD5: c1ba2bce350a9720ffbb40ed215b3857 SHA-1: bb0ed6438e52b742008fc8e5070edbe19d4219cf SHA-256: 06aa198c6c7505c0cbd97c98fc5a7bc7760caad0db34513a7d497b41ccc1674a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple OLE objects and specifically triggers ".objupdate" which forces OLE activation. The critical heuristic "RTF_EQUATION_EDITOR" indicates exploitation of the Equation Editor vulnerability. The embedded OLE objects, particularly objdata_00_off00000a86.bin and objdata_02_off00008a13.bin, are likely payloads. The DOC BODY contains what appears to be obfuscated VBScript code, suggesting the embedded object is a VBScript downloader or executor.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000a86.bin` `c6be2373d74934887d54668419bc0c136f13a8d7ebc7fc3d76544b34aeca903c`	rtf-objdata-decoded	RTF \objdata at offset 0xA86	13660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).
`objdata_01_off00007c40.bin` `af3f607f9fc7ef03a8da841f5957032a4e1ea9827fc6aa98c063d6c38442999a`	rtf-objdata-decoded	RTF \objdata at offset 0x7C40	126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_02_off00008a13.bin` `db4ffd933cb54cb728631f8f9fb5697ba0a42bc4474fe72c60d13dc4bbc0981b`	rtf-objdata-decoded	RTF \objdata at offset 0x8A13	267326 bytes

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