blacknet | 86f5d60117c8881242d3e23e6f966306dc32265f8f1ba8a7ccd6c146bea3cf24

General

Target

4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
Size

316KB
MD5

638681d2a3ca3ab15791adf63e068f5c
SHA1

8d9be64a501184e14eeeb3bd1b1f2bc6d7ab7c53
SHA256

4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c
SHA512

f407a7e234e7ee7fc7a756335420f2b6056838c6a8734ba7daf98f31abde19d36b41c6f28e3d3e5e49e857d539f0cf14fb8ae8b5f915208fc4fbe551d31ad555

Score

10^/10

blacknet second persistence trojan

Malware Config

Extracted

Family

blacknet

Version

v3.7.0 Public

Botnet

Second

C2

https://mailquickdiate.com

Mutex

BN[e9ebec8bb16ee9a3]

Attributes

antivm
false
elevate_uac
false
install_name
WindowsUpdate.exe
splitter
|BN|
start_name
e162b1333458a713bc6916cc8ac4110c
startup
true
usb_spread
false

aes.plain

Signatures

BlackNET
BlackNET is an open source remote access tool written in VB.NET.
trojan blacknet

BlackNET Payload 4 IoCs

resource	yara_rule
behavioral1/memory/780-54-0x0000000000930000-0x0000000000984000-memory.dmp	family_blacknet
behavioral1/files/0x0008000000012300-60.dat	family_blacknet
behavioral1/files/0x0008000000012300-61.dat	family_blacknet
behavioral1/memory/1572-62-0x0000000000950000-0x00000000009A4000-memory.dmp	family_blacknet

Contains code to disable Windows Defender 4 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral1/memory/780-54-0x0000000000930000-0x0000000000984000-memory.dmp	disable_win_def
behavioral1/files/0x0008000000012300-60.dat	disable_win_def
behavioral1/files/0x0008000000012300-61.dat	disable_win_def
behavioral1/memory/1572-62-0x0000000000950000-0x00000000009A4000-memory.dmp	disable_win_def

Executes dropped EXE 1 IoCs

pid	Process
1572	WindowsUpdate.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\e162b1333458a713bc6916cc8ac4110c = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft\\MyClient\\WindowsUpdate.exe"	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Software\Microsoft\Windows\CurrentVersion\Run\e162b1333458a713bc6916cc8ac4110c = "C:\\Users\\Admin\\AppData\\Local\\Temp\\4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe"	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
572	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
1572	WindowsUpdate.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
Token: SeDebugPrivilege	1572	WindowsUpdate.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
1572	WindowsUpdate.exe
1572	WindowsUpdate.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 780 wrote to memory of 528	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	28
PID 780 wrote to memory of 528	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	28
PID 780 wrote to memory of 528	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	28
PID 528 wrote to memory of 572	528	cmd.exe	31
PID 528 wrote to memory of 572	528	cmd.exe	31
PID 528 wrote to memory of 572	528	cmd.exe	31
PID 780 wrote to memory of 1572	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	30
PID 780 wrote to memory of 1572	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	30
PID 780 wrote to memory of 1572	780	4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe	30

C:\Users\Admin\AppData\Local\Temp\4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe
"C:\Users\Admin\AppData\Local\Temp\4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:780
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ping 1.1.1.1 -n 5 -w 5000 > Nul & Del "C:\Users\Admin\AppData\Local\Temp\4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:528
- - C:\Windows\system32\PING.EXE
    ping 1.1.1.1 -n 5 -w 5000
    3⤵
    - Runs ping.exe
    PID:572
- C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe
  "C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:1572

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe

Filesize
316KB

MD5
638681d2a3ca3ab15791adf63e068f5c

SHA1
8d9be64a501184e14eeeb3bd1b1f2bc6d7ab7c53

SHA256
4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c

SHA512
f407a7e234e7ee7fc7a756335420f2b6056838c6a8734ba7daf98f31abde19d36b41c6f28e3d3e5e49e857d539f0cf14fb8ae8b5f915208fc4fbe551d31ad555

Download Submit
C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe

Filesize
316KB

MD5
638681d2a3ca3ab15791adf63e068f5c

SHA1
8d9be64a501184e14eeeb3bd1b1f2bc6d7ab7c53

SHA256
4fbba14a292b8827b2034f8a3b22ad408248e64585876cd93d7eb9e4bf96735c

SHA512
f407a7e234e7ee7fc7a756335420f2b6056838c6a8734ba7daf98f31abde19d36b41c6f28e3d3e5e49e857d539f0cf14fb8ae8b5f915208fc4fbe551d31ad555

Download Submit
memory/780-54-0x0000000000930000-0x0000000000984000-memory.dmp

Filesize
336KB

Download
memory/780-55-0x000007FEFBA91000-0x000007FEFBA93000-memory.dmp

Filesize
8KB

Download
memory/780-56-0x000000001B269000-0x000000001B288000-memory.dmp

Filesize
124KB

Download
memory/780-65-0x000000001B269000-0x000000001B288000-memory.dmp

Filesize
124KB

Download
memory/1572-62-0x0000000000950000-0x00000000009A4000-memory.dmp

Filesize
336KB

Download
memory/1572-64-0x000000001B629000-0x000000001B648000-memory.dmp

Filesize
124KB

Download

Analysis

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