socks5systemz | 4519ffb96ab3e8a4746518455911475f459685fc4174251a17552f1f100c93b5

General

Target

stail.exe
Size

5.9MB
MD5

5ce6dc42328ec1134eb1af7ceb781608
SHA1

8c62c89a91b5372530617d5135aa7e3a08374a21
SHA256

4519ffb96ab3e8a4746518455911475f459685fc4174251a17552f1f100c93b5
SHA512

4d0a63bd1221f1abba3456e2620d1bf8b60e17909d106fa1413d2bbf764fc643733006e84e3536d9459539f55794ba0eabd6d1cc46a657e3c96cdbbd7e670e78
SSDEEP

98304:4ZRChvOv4yzF7CW7NEwaT3/fKg2LCvkU2fxr4ZsbAqzJao8PmXKQZUX2L9JTg:0Cs35JEwaj/12OsU2fB+hqkxP6KIUGLA

Score

10^/10

Malware Config

Signatures

Detect Socks5Systemz Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2732-113-0x0000000002410000-0x00000000024B2000-memory.dmp	family_socks5systemz

Socks5Systemz
Socks5Systemz is a botnet written in C++.
botnet socks5systemz
Socks5systemz family
socks5systemz

Executes dropped EXE 2 IoCs

pid	Process
2108	stail.tmp
2732	hdvideoconverterfox125.exe

Loads dropped DLL 5 IoCs

pid	Process
2640	stail.exe
2108	stail.tmp
2108	stail.tmp
2108	stail.tmp
2108	stail.tmp

Unexpected DNS network traffic destination 1 IoCs

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

description	ioc
Destination IP	45.155.250.90

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	stail.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	stail.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	hdvideoconverterfox125.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net1.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2108	stail.tmp
2108	stail.tmp

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2108	stail.tmp

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2640 wrote to memory of 2108	2640	stail.exe	31
PID 2108 wrote to memory of 316	2108	stail.tmp	32
PID 2108 wrote to memory of 316	2108	stail.tmp	32
PID 2108 wrote to memory of 316	2108	stail.tmp	32
PID 2108 wrote to memory of 316	2108	stail.tmp	32
PID 2108 wrote to memory of 2732	2108	stail.tmp	34
PID 2108 wrote to memory of 2732	2108	stail.tmp	34
PID 2108 wrote to memory of 2732	2108	stail.tmp	34
PID 2108 wrote to memory of 2732	2108	stail.tmp	34
PID 316 wrote to memory of 2344	316	net.exe	35
PID 316 wrote to memory of 2344	316	net.exe	35
PID 316 wrote to memory of 2344	316	net.exe	35
PID 316 wrote to memory of 2344	316	net.exe	35

C:\Users\Admin\AppData\Local\Temp\stail.exe
"C:\Users\Admin\AppData\Local\Temp\stail.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2640
- C:\Users\Admin\AppData\Local\Temp\is-EJS01.tmp\stail.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-EJS01.tmp\stail.tmp" /SL5="$400F4,5977381,56832,C:\Users\Admin\AppData\Local\Temp\stail.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of WriteProcessMemory
  PID:2108
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\system32\net.exe" pause hd_video_converter_fox_125
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:316
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 pause hd_video_converter_fox_125
      4⤵
      System Location Discovery: System Language Discovery
      PID:2344
- - C:\Users\Admin\AppData\Local\HD Video Converter Fox 1.2.5\hdvideoconverterfox125.exe
    "C:\Users\Admin\AppData\Local\HD Video Converter Fox 1.2.5\hdvideoconverterfox125.exe" -i
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2732

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\HD Video Converter Fox 1.2.5\hdvideoconverterfox125.exe

Filesize
4.1MB

MD5
3e5665842edf692c5da51975bea8be54

SHA1
df865efaaa7de117b983588fefd7474053cf3bff

SHA256
21e988aa820894faeb5f57171734501a444be9ac2758a2b17bcc9a4b677ba495

SHA512
75b721cb68c254c6ba26d82cbbb38ace5928a386d5428f651e56734a1a70de55c315378e8bc2d95b26f90b51095229e1ce5f239c177dff1204e31d18cc4a486d

Download Submit
\Users\Admin\AppData\Local\Temp\is-8CFMH.tmp\_isetup\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
\Users\Admin\AppData\Local\Temp\is-8CFMH.tmp\_isetup\_shfoldr.dll

Filesize
22KB

MD5
92dc6ef532fbb4a5c3201469a5b5eb63

SHA1
3e89ff837147c16b4e41c30d6c796374e0b8e62c

SHA256
9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87

SHA512
9908e573921d5dbc3454a1c0a6c969ab8a81cc2e8b5385391d46b1a738fb06a76aa3282e0e58d0d2ffa6f27c85668cd5178e1500b8a39b1bbae04366ae6a86d3

Download Submit
\Users\Admin\AppData\Local\Temp\is-EJS01.tmp\stail.tmp

Filesize
692KB

MD5
3c6aff88c22351bcb786883117ab81d7

SHA1
f848e3560ff4343b5756f440681d4c0b9628b066

SHA256
21bd2a3387abb64f55d96e6d1c62f32a386d4431701baffc51a0282c490076ad

SHA512
b7f9c7e24239129ac98f3d6f27ce63b95909000838caaa5bb9dbcd6a1a65448478f3633726f01f98708c2e65d06ff5c3f086a1d2d2e5a91dbbc7e2703ff0ab74

Download Submit
memory/2108-123-0x00000000035B0000-0x00000000039D4000-memory.dmp

Filesize
4.1MB

Download
memory/2108-88-0x00000000035B0000-0x00000000039D4000-memory.dmp

Filesize
4.1MB

Download
memory/2108-8-0x0000000000400000-0x00000000004BD000-memory.dmp

Filesize
756KB

Download
memory/2108-94-0x0000000000400000-0x00000000004BD000-memory.dmp

Filesize
756KB

Download
memory/2640-95-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2640-2-0x0000000000401000-0x000000000040B000-memory.dmp

Filesize
40KB

Download
memory/2640-0-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/2732-106-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-122-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-100-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-103-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-91-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-109-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-112-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-113-0x0000000002410000-0x00000000024B2000-memory.dmp

Filesize
648KB

Download
memory/2732-119-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-97-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-90-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-126-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-129-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-132-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-135-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-139-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download
memory/2732-142-0x0000000000400000-0x0000000000824000-memory.dmp

Filesize
4.1MB

Download

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