Analysis and Detection of CLOUD#REVERSER: An Attack Involving Threat Actors Compromising Systems Using A Sophisticated Cloud-Based Malware

2024-05-21 Securonix

https://www.securonix.com/blog/analysis-and-detection-of-cloudreverser-an-attack-involving-threat-actors-compromising-systems-using-a-sophisticated-cloud-based-malware/

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CLOUD#REVERSER uses phishing-delivered ZIP archives and an executable disguised as an Excel file to install a multi-stage VBScript and PowerShell infection chain. The malware persists through scheduled tasks that mimic Google update jobs, repeatedly executing payloads from `C:\ProgramData` while abusing Dropbox and Google Drive APIs for staging, command retrieval, script self-updates, and data exfiltration. Securonix observed a later-stage PowerShell component that downloaded a gzip-compressed payload, loaded it in memory via .NET reflection, and connected to `159.100.13.216:6606` for hands-on command execution. The article notes overlap in cloud-storage abuse with the earlier DEEP#GOSU campaign associated with North Korean Kimsuky, but it does not firmly attribute CLOUD#REVERSER itself to a DPRK actor.

Indicators of Compromise

Type Value First Seen Last Seen
IPv4 159.100.13.216 2024-09-05 2025-03-12
HASH f4275b0d3c4b6f3a165984b862f4890… 2024-11-19 2024-11-19

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2024-07-19 • 39% Match
#Trend #Andariel #Kimsuky #MoonstoneSleet #Lazarus #T1082 #T1059.003 #T1090 #T1140 #T1005 #T1070.004 #T1041 #T1113 #T1555 #T1560 #T1071.001 #T1046 #T1112 #T1115 #T1083 #T1497 #T1056.001 #T1036 #T1027 #T1204.002 #T1566.002 #T1555.003 #T1071 #T1124 #T1222 #T1552 #T1057 #T1583.003 #T1518.001 #T1547.001 #T1053.005 #T1539 #T1608.005 #T1583.001 #T1059.001 #T1053 #T1552.001 #T1566 #T1059 #T1003 #T1497.001 #T1102.001 #T1574.002 #T1562.001 #T1490 #T1486 #T1129 #T1133 #T1571 #T1548 #T1190 #T1203 #T1564.001 #T1087 #T1562.004 #T1218.011 #T1070.006 #T1547 #T1068 #T1614 #T1573 #T1095 #T1562 #T1070 #T1047 #T1056 #T1176 #T1010 #T1033 #T1569.002 #T1543.003 #T1485 #T1012 #T1202 #T1087.002 #T1021.004 #T1222.001 #T1518 #T1564.003 #T1505.003 #T1069.002 #T1564 #T1595.002 #T1027.005 #T1070.001 #T1056.004 #T1584
Shares tags: T1082, T1059.003, T1070.004
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