nullmixer | d74a07eeb26faeed4799f582bcb3c22ba985cc7bf21685d3b6e37aa694a72d97

Analysis

max time kernel
151s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2023 05:29

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General

Target

2a0a05bcae0114f543206ed1a81a8c69.exe
Size

1.5MB
MD5

2a0a05bcae0114f543206ed1a81a8c69
SHA1

0e6b17c5c3dcab55697b4589e8a239961fac9ed0
SHA256

d74a07eeb26faeed4799f582bcb3c22ba985cc7bf21685d3b6e37aa694a72d97
SHA512

5aaee090fc713af1add2a040bb6cfdde26650c6991249d7cfe94bfdb04e5a9a65f2ede7db317a2eb67e0763a097c997612fbef2c9829053e81bb6d9afe97f9cb
SSDEEP

49152:xcBECpZgu2Wk+EwJ84vLRaBtIl9mTXcRjt0S:xaZ2WOCvLUBsKsFt0S

Score

10^/10

nullmixer smokeloader pub6 aspackv2 backdoor dropper evasion trojan

Malware Config

Extracted

Family

nullmixer

http://marisana.xyz/

Extracted

Family

smokeloader

Botnet

pub6

Extracted

Family

smokeloader

Version

2020

http://conceitosseg.com/upload/

http://integrasidata.com/upload/

http://ozentekstil.com/upload/

http://finbelportal.com/upload/

http://telanganadigital.com/upload/

rc4.i32

Signatures

Modifies Windows Defender Real-time Protection settings 3 TTPs 7 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	karotima_1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	karotima_1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	karotima_1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1"	karotima_1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableIOAVProtection = "1"	karotima_1.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableRawWriteNotification = "1"	karotima_1.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	karotima_1.exe

NullMixer
NullMixer is a malware dropper leading to an infection chain of a wide variety of malware families.
dropper nullmixer
SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader

ASPack v2.12-2.42 5 IoCs

Detects executables packed with ASPack v2.12-2.42

aspackv2

resource	yara_rule
behavioral2/files/0x000a000000023146-18.dat	aspack_v212_v242
behavioral2/files/0x000a000000023146-21.dat	aspack_v212_v242
behavioral2/files/0x0008000000023138-31.dat	aspack_v212_v242
behavioral2/files/0x0008000000023138-26.dat	aspack_v212_v242
behavioral2/files/0x000800000002313d-25.dat	aspack_v212_v242

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation	2a0a05bcae0114f543206ed1a81a8c69.exe

Executes dropped EXE 4 IoCs

pid	Process
1320	setup_install.exe
4968	karotima_2.exe
4004	karotima_1.exe
1832	eifcwtu

Loads dropped DLL 8 IoCs

pid	Process
1320	setup_install.exe
1320	setup_install.exe
1320	setup_install.exe
1320	setup_install.exe
1320	setup_install.exe
1320	setup_install.exe
4968	karotima_2.exe
1832	eifcwtu

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
15	ipinfo.io
16	ipinfo.io

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3980	1320	WerFault.exe	91

Checks SCSI registry key(s) 3 TTPs 6 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	eifcwtu
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	karotima_2.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	karotima_2.exe
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	karotima_2.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	eifcwtu
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	eifcwtu

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4968	karotima_2.exe
4968	karotima_2.exe
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found
3172	Process not Found

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
4968	karotima_2.exe
1832	eifcwtu

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeShutdownPrivilege	3172	Process not Found
Token: SeCreatePagefilePrivilege	3172	Process not Found

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3172	Process not Found
3172	Process not Found

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3172	Process not Found

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 1320	1608	2a0a05bcae0114f543206ed1a81a8c69.exe	91
PID 1608 wrote to memory of 1320	1608	2a0a05bcae0114f543206ed1a81a8c69.exe	91
PID 1608 wrote to memory of 1320	1608	2a0a05bcae0114f543206ed1a81a8c69.exe	91
PID 1320 wrote to memory of 4784	1320	setup_install.exe	97
PID 1320 wrote to memory of 4784	1320	setup_install.exe	97
PID 1320 wrote to memory of 4784	1320	setup_install.exe	97
PID 1320 wrote to memory of 3064	1320	setup_install.exe	94
PID 1320 wrote to memory of 3064	1320	setup_install.exe	94
PID 1320 wrote to memory of 3064	1320	setup_install.exe	94
PID 3064 wrote to memory of 4968	3064	cmd.exe	96
PID 3064 wrote to memory of 4968	3064	cmd.exe	96
PID 3064 wrote to memory of 4968	3064	cmd.exe	96
PID 4784 wrote to memory of 4004	4784	cmd.exe	95
PID 4784 wrote to memory of 4004	4784	cmd.exe	95
PID 4784 wrote to memory of 4004	4784	cmd.exe	95

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\2a0a05bcae0114f543206ed1a81a8c69.exe
"C:\Users\Admin\AppData\Local\Temp\2a0a05bcae0114f543206ed1a81a8c69.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1608
- C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\setup_install.exe
  "C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\setup_install.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1320
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c karotima_2.exe
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3064
  - - C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\karotima_2.exe
      karotima_2.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Checks SCSI registry key(s)
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      PID:4968
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c karotima_1.exe
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4784
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1320 -s 444
    3⤵
    - Program crash
    PID:3980

C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\karotima_1.exe
karotima_1.exe
1⤵
- Modifies Windows Defender Real-time Protection settings
- Executes dropped EXE
PID:4004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1320 -ip 1320
1⤵
PID:3752

C:\Users\Admin\AppData\Roaming\eifcwtu
C:\Users\Admin\AppData\Roaming\eifcwtu
1⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks SCSI registry key(s)
- Suspicious behavior: MapViewOfSection
PID:1832

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\libcurl.dll

Filesize
218KB

MD5
d09be1f47fd6b827c81a4812b4f7296f

SHA1
028ae3596c0790e6d7f9f2f3c8e9591527d267f7

SHA256
0de53e7be51789adaec5294346220b20f793e7f8d153a3c110a92d658760697e

SHA512
857f44a1383c29208509b8f1164b6438d750d5bb4419add7626986333433e67a0d1211ec240ce9472f30a1f32b16c8097aceba4b2255641b3d8928f94237f595

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\libcurl.dll

Filesize
92KB

MD5
0151c5c4a0ebf14b04ddf243564436d6

SHA1
5bcaf3f5bbcf6229483686d585b1106071b60c4d

SHA256
84fd229f8269a62e61267c8f71d91e25b9ff4f82dfdbb56083c050e2b223e0ab

SHA512
520080e496be6bb744c41e7549b6f250797742245d5bc2097a471be66962ed7ce468c8e076042375a6f443b392a85f19a0e5392638bc14bd08bd405744560d04

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\libcurlpp.dll

Filesize
54KB

MD5
e6e578373c2e416289a8da55f1dc5e8e

SHA1
b601a229b66ec3d19c2369b36216c6f6eb1c063e

SHA256
43e86d650a68f1f91fa2f4375aff2720e934aa78fa3d33e06363122bf5a9535f

SHA512
9df6a8c418113a77051f6cb02745ad48c521c13cdadb85e0e37f79e29041464c8c7d7ba8c558fdd877035eb8475b6f93e7fc62b38504ddfe696a61480cabac89

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\libgcc_s_dw2-1.dll

Filesize
113KB

MD5
9aec524b616618b0d3d00b27b6f51da1

SHA1
64264300801a353db324d11738ffed876550e1d3

SHA256
59a466f77584438fc3abc0f43edc0fc99d41851726827a008841f05cfe12da7e

SHA512
0648a26940e8f4aad73b05ad53e43316dd688e5d55e293cce88267b2b8744412be2e0d507dadad830776bf715bcd819f00f5d1f7ac1c5f1c4f682fb7457a20d0

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\libwinpthread-1.dll

Filesize
69KB

MD5
1e0d62c34ff2e649ebc5c372065732ee

SHA1
fcfaa36ba456159b26140a43e80fbd7e9d9af2de

SHA256
509cb1d1443b623a02562ac760bced540e327c65157ffa938a22f75e38155723

SHA512
3653f8ed8ad3476632f731a3e76c6aae97898e4bf14f70007c93e53bc443906835be29f861c4a123db5b11e0f3dd5013b2b3833469a062060825df9ee708dc61

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS846A4B57\setup_install.exe

Filesize
287KB

MD5
57bfe9fe09c69c1f1ca4d484db1ed84a

SHA1
7bc744a5980f08eaac7622387df0c061a967d5b6

SHA256
e21ebd099758bc8552b9f1b8b8026a8b73857b299b1995273f4ce9c989a0c83b

SHA512
3304e78c461e6e754af12e85c83039a06f92d2fa74e7430f31941b130560b77fc346a59235baab131308ece20e5db84c2a757bfb47a1319cbcc24b37edad0e38

Download Submit
C:\Users\Admin\AppData\Local\Temp\CC4F.tmp

Filesize
1.6MB

MD5
4f3387277ccbd6d1f21ac5c07fe4ca68

SHA1
e16506f662dc92023bf82def1d621497c8ab5890

SHA256
767a3fc4a7a6818cdc3f0b99aaa95db694f6bcde719d2057a88b3d4df3d74fac

SHA512
9da199ac69e3c0d4e0c6307e0ab8178f12cc25cb2f14c3511f6b64e6e60a925c860f3263cb38353a97b55a71ef4d27f8cb7fa3cfc08e7c1a349fd8d209dfa219

Download Submit
C:\Users\Admin\AppData\Roaming\eifcwtu

Filesize
325KB

MD5
2adf1986be67af56f5bfe1b9b857bdaa

SHA1
4336779d7127ea074a561632bc838b94e460a0f1

SHA256
1c83bfcca6d10cdb603db804212d2ff60a478cbdd3c8547636e733a1e2bae28d

SHA512
c86ffccffdc0378bd5241ca8ebbb7b0ac94901feaa37f53757d290c8785d15bdb75c837e93e88c57e597cbacdb7d2ceac8af992091fee35e2934afbfcd2424f7

Download Submit
memory/1320-52-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-75-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/1320-54-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-50-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-48-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/1320-47-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/1320-45-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-44-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-42-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/1320-43-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-41-0x0000000064940000-0x0000000064959000-memory.dmp

Filesize
100KB

Download
memory/1320-39-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-36-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/1320-51-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-49-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-46-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-28-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/1320-40-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/1320-38-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/1320-22-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-37-0x00000000007A0000-0x000000000082F000-memory.dmp

Filesize
572KB

Download
memory/1320-73-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/1320-74-0x0000000064940000-0x0000000064959000-memory.dmp

Filesize
100KB

Download
memory/1320-53-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-77-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/1320-72-0x0000000000400000-0x000000000051E000-memory.dmp

Filesize
1.1MB

Download
memory/1320-76-0x000000006EB40000-0x000000006EB63000-memory.dmp

Filesize
140KB

Download
memory/1832-85-0x0000000000510000-0x0000000000610000-memory.dmp

Filesize
1024KB

Download
memory/1832-86-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1832-94-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/3172-67-0x00000000028E0000-0x00000000028F5000-memory.dmp

Filesize
84KB

Download
memory/3172-91-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

Filesize
84KB

Download
memory/4968-70-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/4968-71-0x0000000000580000-0x0000000000589000-memory.dmp

Filesize
36KB

Download
memory/4968-62-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/4968-60-0x0000000000620000-0x0000000000720000-memory.dmp

Filesize
1024KB

Download
memory/4968-61-0x0000000000580000-0x0000000000589000-memory.dmp

Filesize
36KB

Download