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SMA: Sharpshooter Payload

Article by Vishal Thakur

This is a SMA of the payload used in the SharpShooter campaign.
The sample shows code-reuse from the Lazarus malware family but full attribution is hard to determine at this time.
The focus of this article is on the networking C2i.

Following is the complete URI for the first connection:

000007FEFA6ABA48 | 4C 8B DC                 | mov r11,rsp                             |
000007FEFA6ABA4B | 53                       | push rbx                                |
000007FEFA6ABA4C | 55                       | push rbp                                |
000007FEFA6ABA4D | 56                       | push rsi                                |
000007FEFA6ABA4E | 57                       | push rdi                                |
000007FEFA6ABA4F | 41 54                    | push r12                                |
000007FEFA6ABA51 | 41 55                    | push r13                                |
000007FEFA6ABA53 | 41 56                    | push r14                                |
000007FEFA6ABA55 | 41 57                    | push r15                                |
000007FEFA6ABA57 | 48 81 EC 88 01 00 00     | sub rsp,188                             |
000007FEFA6ABA5E | 48 8B 05 5B 8B 05 00     | mov rax,qword ptr ds:[7FEFA7045C0]      |
000007FEFA6ABA65 | 48 33 C4                 | xor rax,rsp                             |
000007FEFA6ABA68 | 48 89 84 24 70 01 00 00  | mov qword ptr ss:[rsp+170],rax          |
000007FEFA6ABA70 | 49 83 A3 78 FF FF FF 00  | and qword ptr ds:[r11-88],0             |
000007FEFA6ABA78 | 41 83 63 80 00           | and dword ptr ds:[r11-80],0             |
000007FEFA6ABA7D | 8B DA                    | mov ebx,edx                             |
000007FEFA6ABA7F | 33 D2                    | xor edx,edx                             |
000007FEFA6ABA81 | 41 8B F0                 | mov esi,r8d                             |
000007FEFA6ABA84 | 4C 8B F1                 | mov r14,rcx                             | rcx:L""
000007FEFA6ABA87 | 44 8D 42 24              | lea r8d,dword ptr ds:[rdx+24]           |

Here's a view from the stack.

The request:

000007FEFA6B4C03 | 41 83 BB 1C 01 00 00 02  | cmp dword ptr ds:[r11+11C],2            | r11+11C:L"tml,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-us;q=0.8;q=0.6,en-us;q=0.4,en;q=0.2\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 384\r\nConnection: Keep-Alive\r\nCache-Control: no-cache\r\n"

POST req with the path:

The second connection:

POST req with the path:

UserAgent used:
Complete URI:
Third connection:

The request:
Sample: 37b04dcdcfdcaa885df0f392524db7ae7b73806ad8a8e76fbc6a2df4db064e71McAfee report:


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