Rewterz Threat Alert – Calypso APT Group’s Attack On A Telecommunications Company In Kazakhstan – Active IOCs

Severity

High

Analysis Summary

One of Kazakhstan’s telecommunication organizations contacted a security solution provider in October 2021 with a suspect of malware on the company’s network. During the investigation, the researchers determined that the company’s internal servers have been infiltrated since 2019. Also, Backdoor.PlugX.93 and BackDoor.Whitebird.30, the Fast Reverse Proxy (FRP) utilities, and RemCom have been discovered as the main attackers’ tools for several years.

Research concluded that the threat actor group specialized in infecting the mail servers of Asian firms that had Microsoft Exchange software installed. Not only from Kazakhstan, but victims from several countries were found, including an Egyptian government agency, an Italian airport, a USA marketing company, Canadian transport, and woodworking companies.

Victims compromised from August 2021 to early November 2021 were included in the logs gathered by the command and control server. In some cases, BackDoor.Whitebird.30 was installed not only on the Microsoft Exchange server, but also on domain controllers. After the research, security researchers conclude that the Calypso APT hacker group is behind the attack.

Impact

• Security Bypass
• Exposure of Sensitive Data
• Data Exfiltration
• Remote Applications Launch

Indicators of Compromise

Domain Name

• webmail[.]surfanny[.]com
• www[.]sultris[.]com
• mail[.]sultris[.]com
• pop3[.]wordmoss[.]com
• zmail[.]wordmoss[.]com
• youtubemail[.]club
• clark[.]l8t[.]net
• blog[.]globnewsline[.]com
• mail[.]globnewsline[.]com

IP

• 45[.]144[.]242[.]216
• 45[.]147[.]228[.]131
• 46[.]105[.]227[.]110
• 5[.]183[.]178[.]181
• 5[.]188[.]228[.]53
• 103[.]30[.]17[.]44
• 103[.]93[.]252[.]150
• 103[.]230[.]15[.]41
• 103[.]251[.]94[.]93
• 104[.]233[.]163[.]136
• 159[.]65[.]157[.]100
• 180[.]149[.]241[.]88
• 185[.]105[.]1[.]226
• 192[.]236[.]177[.]250
• 209[.]250[.]241[.]35

MD5

• 735d95dc1cb8e4e294016348b6d3beaa
• e43c3051efa82576af905f4c9bbd5d57
• 7e1e4e1719cb9d3f6da7722dd20f8420
• 2abe9d7bf439a502208df0fe5210288b
• 10b83195c37bb7aa3c7fbb4312601a19
• 1fa7aa5695c75c8a24422c1292285aba
• 1ca3b8e83ca492226ff263073be018b8
• 189a0f223352f91d907214ad4f49840e
• 8741e28238b28361fe4b58bffce7f3da
• 958d54ea3f49c5397b8b9414cb7ccc67
• c671126a995025c3ebed5748f7565510
• 2abe9d7bf439a502208df0fe5210288b
• 8e3bf34f8ed3bbf32d7a89b589c30726
• 2df56cc2b0a1f179e62b654de98a6077
• 5b913f8238934032c332b835c8961dca
• 10b83195c37bb7aa3c7fbb4312601a19
• c7f8654f266f37ed4975030505fda5e8
• 64bae315170cb7cdc46fde2613163c64
• 735d95dc1cb8e4e294016348b6d3beaa
• 5f926942408ada30bea069da386a5ad3
• edd2e4d4679317f959b486f5a84cc3ff
• 0cd20f7ce761eda2c3f014818ab0ad50
• 54a51c5477c2e6b746a65f1ceac4fa8d
• 5fe53ae52275102eb6db162685175139
• e43c3051efa82576af905f4c9bbd5d57
• a78255f9205bff53ca9db214aaee4d0e
• b0e90d483ac14f1929de6ed8e8af878a
• 6983f7001de10f4d19fc2d794c3eb534
• bab3877af8acd9c2475fe0f767e39f39
• 996c3eb5c21a20dd13b7ceee6c80b673

SHA-256

• 6ecfb85d150fc903a8983ae934b7d2ab7b993f87e2c42301a4e603e18483b96b
• a18411eae5439f6f1d6a8b35a45e55e4d3e449012f8d1393056ed090e6389e95
• 279c42bee4b3a1303ec134672d306fc21210af51f06fd0807f26e249ff8086fe
• 955b0a859aefaef96e77bc9ed514a7f901561a031dfdd9599793cec7c55cbde9
• 9003908fa51ef746fda79a33d474c375640218ad654fd4368c935b2c41a1ff0f
• a02515595bfff6567a7ff830ad8045ccf2fce61d0b28eec0cb6ae94cb5f0303f
• efc63d5cb370e464d6b6c1e31c8af93c47d2e12d7b115183555679071cafce93
• 70feb00b89457044cbd6766c7adad5a432b8d3130b01ba33e54c1b20ab0a9432
• 27ceb3af67905d9ddaffb29031677c0a701a17d6fb179a26e24edffbced49357
• 1f5fc1dae073fb7442b355a0fa8f20d28be709b2a999c26121783bb181213f81
• 309aac6aef02a6ce02608e041d965c131f9d65bea0bec3d34b3881c848c728e2
• 955b0a859aefaef96e77bc9ed514a7f901561a031dfdd9599793cec7c55cbde9
• e576ec1e2630c71e0b7b15aad8c8db562dabb80ec4fc26f5480b7977f79978db
• 78d185c603e094065d0c86ffa99aa7f3ceba049f277e314d5d51d0c9b25beeff
• 7843af73e8093b094f1d685f151cf8270358530b4e3f5f47adfcb220ad66f43c
• 9003908fa51ef746fda79a33d474c375640218ad654fd4368c935b2c41a1ff0f
• a58f8db7cfccab2925ebfe8537451c2c5d93b3ae56dde4225684bbecb33d8808
• 1f2b98ab7724e6dde63c8b750a7bf71bc85d0081c4798f91e14941e86b5ee0be
• 6ecfb85d150fc903a8983ae934b7d2ab7b993f87e2c42301a4e603e18483b96b
• cdc9c0b23857dbcd94859964f67ce138b1e3b815eeb6f0267a7a00477ab2d2d5
• 099df583bbada49c64fbbaf516f937b7d0ea9d16e762d30206987af872d5548e
• a94fa35aaa2ec10e9cee7795e67f3ef435477200a0403b0a1fcc95cf7e06295d
• 1f8dd0b374180963fd4381012cce52a49b59261fc218ecece7a7837e6de44b1c
• 45f92aa1b3886f029fcc8cb67778f13f1e65ec844b6471e8def1886103bee321
• a18411eae5439f6f1d6a8b35a45e55e4d3e449012f8d1393056ed090e6389e95
• ad55bf10a754acef9ff4ace1369c148d4804f3543ba34b173d00c4977c4a0b8a
• ab678bbd30328e20faed53ead07c2f29646eb8042402305264388543319e949c
• 3c2fe308c0a563e06263bbacf793bbe9b2259d795fcc36b953793a7e499e7f71
• 9f8d8bef6a69e3c17fef39f91ccb87507cbb6e56fdd67637825c49630dbeb82c
• 42ef8fb1eadf609c84262dcfa569ba63c8e31dce25347ab0dd79bb778e7790a1

SHA-1

• a8bff99e1ea76d3de660ffdbd78ad04f81a8c659
• abfd737b14413a7c6a21c8757aeb6e151701626a
• 1a4b8232237651881750911853cf22d570eada9e
• 595b5a7f25834df7a4af757a6f1c2838eea09f7b
• ff82dcadb969307f93d73bbed1b1f46233da762f
• 7412b13e27433db64b610f40232eb4f0bf2c8487
• f783fc5d3fc3f923c2b99ef3a15a38a015e2735a
• 65f64cc7aaff29d4e62520afa83b621465a79823
• 8b9e60735344f91146627213bd13c967c975a783
• 84d5f015d8b095d24738e45d2e541989e6221786
• 3d8a3fcfa2584c8b598836efb08e0c749d4c4aab
• 595b5a7f25834df7a4af757a6f1c2838eea09f7b
• 46e999d88b76cae484455e568c2d39ad7c99e79f
• b1041acbe71d46891381f3834c387049cbbb0806
• 635e3cf8fc165a3595bb9e25030875f94affe40f
• ff82dcadb969307f93d73bbed1b1f46233da762f
• 429357f91dfa514380f06ca014d3801e3175894d
• cc5bce8c91331f198bb080d364aed1d3301bfb0c
• a8bff99e1ea76d3de660ffdbd78ad04f81a8c659
• 5a171b55b644188d81218d3f469cf0500f966bac
• b3ecb0ac5bebc87a3e31adc82fb6b8cc4fb66d63
• a3347d3dc5e7c3502d3832ce3a7dd0fc72e6ea49
• 36624dc9cd88540c67826d10b34bf09f46809da7
• 16728655e5e91a46b16c3fe126d4d18054a570a1
• abfd737b14413a7c6a21c8757aeb6e151701626a
• a5829ed81f59bebf35ffde10928c4bc54cadc93b
• 4f0ea31a363cfe0d2bbb4a0b4c5d558a87d8683e
• 23873bf2670cf64c2440058130548d4e4da412dd
• a6e9f5d8295d67ff0a5608bb45b8ba45a671d84c
• 39c5459c920e7c0a325e053116713bfd8bc5ddaf

Remediation

• Block all threat indicators at their respective controls
• Search for IOCs in your environment.
• Do not download software and files from unofficial and untrusted sources