UnknownPublished 28 Aug 2023

type osint · Pandora analysis (INV0027378237.7z) · Malicious attachment

Affects type osintSource CIRCL OSINT Feed

TLP:WHITE, disclosure is not limited

Description

Pandora analysis (INV0027378237.7z) - Malicious attachment

Impact

European organizations are at risk primarily from successful spearphishing attempts that could lead to initial network compromise. Execution of the malicious attachment may result in unauthorized access, data theft, lateral movement, and potential operational disruption. The use of commonly used ports for network activity increases the likelihood of evading firewall and intrusion detection systems, enabling attackers to maintain stealthy C2 channels. Organizations handling sensitive data, critical infrastructure, or intellectual property could face confidentiality breaches or operational impacts if the threat materializes or evolves. Although currently assessed as low severity, the actual impact depends on the payload delivered, which remains unspecified. The moderate certainty and lack of known exploits suggest this is an emerging threat, but given the prevalence of spearphishing in Europe, vigilance is necessary. The threat could affect sectors such as finance, government, healthcare, and manufacturing, where spearphishing is a common initial attack vector.

Defensive guidance

European organizations should implement advanced email security solutions capable of deep inspection of compressed attachments like 7z files, including sandboxing and behavioral analysis to detect malicious payloads. User training programs must emphasize the risks of spearphishing and the dangers of opening unexpected or suspicious compressed attachments. Network monitoring should focus on detecting anomalous outbound traffic over commonly used ports, correlating with potential C2 activity. Strict egress filtering and anomaly detection systems should be deployed to identify and block unauthorized communications. Endpoint Detection and Response (EDR) tools should be tuned to detect suspicious archive extraction activities and script executions. Enforcing multi-factor authentication and least privilege access controls can limit attacker movement and impact. Since no patches exist, proactive detection, rapid incident response, and threat intelligence sharing are critical to mitigating this threat. Regular updates to detection signatures based on indicators such as file hashes and domains should be maintained.

Indicators of compromise

Domains 1

rex1010.duckdns.org

IP addresses 1

89.117.55.98

Hashes 4

a86cc9672c8c4fdf34fba38b7c63562b
1b254621918e9f35783c870d045e6bc0ed66696a
e8cdb541ecfffd85cd71fe64b08ed06728b7c14c4079a51b85b0032178338617
bc43460df406c322ffa65d30eded395a278316c53e2892b870dca3db62f5f91bf30b0b3e54d0084eaa8e4f770a96ca9a547ea84568eb209fbfa9f26ec8ece75e

File 1

INV0027378237.7z

Size in bytes 1

581791

Float 1

7.99916572661

Malware sample 1

INV0027378237.7z|a86cc9672c8c4fdf34fba38b7c63562b

Mime type 1

application/x-rar

Ssdeep 1

12288:AnTypEagRPxTZO6ce2gNTb0TjxEH1vfV6ZO2tdXpViQn/l:AnTsIFO6ce22TgTjGVvtH2tJn/l

Link 2

https://www.virustotal.com/gui/file/e8cdb541ecfffd85cd71fe64b08ed06728b7c14c4079a51b85b0032178338617
https://www.virustotal.com/gui/ip_address/89.117.55.98

Text 2

31/56
4/88

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