China's largest bank hit by ransomware attack

ICBC, the largest bank in China, suffered a devastating ransomware attack which disrupted its financial services (FS) systems, with a knock-on effect of affecting US Treasury markets, and sending ripples across the global financial world. 

Multiple news outlets reported that ICBC was attacked by LockBit, a ransomware operation with possible ties to Russia. However, as LockBit is a ransomware-as-a-service operation, the culprits could actually be any one of its affiliates.

It's not yet known how much money the attackers are demanding in exchange for the decryption key, or if they managed to steal any sensitive data during the attack.

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CitrixBleed

A notice on the ICBC website says that upon noticing the incident, ICBC FS “disconnected and isolated impacted systems to contain the incident," adding that an investigation was underway, as well as recovery efforts. ICBC’s financial services business and email systems operate independently from the bank, as well as overseas affiliates which didn’t seem affected by the attack.

Cybersecurity researcher Kevin Beaumont argues that the attackers leveraged a known vulnerability in Citrix Netscaler boxes, called CitrixBleed, to move past any authentication protocols. CitrixBleed is tracked as CVE-2023-4966 and carries a severity score of 9.4. It was patched a month ago. In the time after the release of the patch, both Citrix and other security firms warned about the vulnerability being abused in the wild. Even CISA sounded the alarm, saying ransomware actors were abusing it, and urging users to apply the patch immediately. 

As per the Financial Times, the attack disrupted US Treasury markets, too. The US Securities Industry and Financial Markets Association (SIMFA) told their members the attack could block trade settling on behalf of other market players, The Register reported. Some equity traders weren’t able to place, or clear, trades, other media reported. 

Ransomware operators have been getting bolder, lately. In fact, with more than 500 recorded attacks, September was a record month. 

Via The Register

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