RTF malware analysis — malicious · 95d42233a9ee875f

MALICIOUS

RTF

1.45 MB

MD5: 5cec417a15f96f4d4aec89eb2417dae2 SHA-1: 50b9a4b392e99ca2d3f1cc20008eb10fa19c9320 SHA-256: 95d42233a9ee875f573de73765605721336930ad7dd18d48b5bca27374570813

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains embedded OLE objects and specifically triggers heuristics related to the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" heuristic indicates that the embedded OLE object is designed to be activated automatically, which is a common method for exploiting this vulnerability. The presence of VBA code within the DOC BODY suggests that the exploit likely leads to the execution of this script, which in turn is expected to download and execute a secondary payload. The exact nature of the payload and its destination could not be determined from the provided evidence.

Heuristics 4

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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001269.bin` `25e97abf7d99fa1c09d3cec2542988dc3275c2636c67dab8f86def235c010e52`	rtf-objdata-decoded	RTF \objdata at offset 0x1269	13593 bytes
`objdata_01_off00008dc3.bin` `1c527e1c5672480806fcc4790098bad4c70fbb7b9efbc15bfcb8f25f510c2d1a`	rtf-objdata-decoded	RTF \objdata at offset 0x8DC3	275202 bytes

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