RTF / .DOC malware analysis — malicious · 7b0f4015ce61a313

MALICIOUS

RTF / .DOC

217.8 KB First seen: 2022-04-14

MD5: fc4549a989ee9bf08fdff506af00820a SHA-1: a4908c1d626e74552e7c1e8828a7bcf7e4bcda08 SHA-256: 7b0f4015ce61a313caff02c7ef299e129be1332f4dfc2290efd64a452e7fbb26

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The RTF document contains multiple embedded OLE objects, with heuristics indicating that \objupdate forces OLE activation and that composite monikers are present. The document body explicitly instructs the user to 'download the document and click Enable Editing', which is a common lure to bypass macro security. This suggests the embedded OLE objects are intended to be executed, likely to download and run a second-stage payload.

Heuristics 6

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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_off0000095d.bin` `455fc6aa87c8c80ad3306fdae1174602917a5f1852c8e2bc3325b0657bc3f3a7`	rtf-objdata-decoded	RTF \objdata at offset 0x95D	15670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000894d.bin` `36dcadcd9dba6c796320cf103eee4d99a0cf65218f74bac40d0f472a6487a1f8`	rtf-objdata-decoded	RTF \objdata at offset 0x894D	2632 bytes
`objdata_02_off00009ef0.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9EF0	12297 bytes

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