nullmixer | ec602e5151e622f2f47d79575dc42aacf84681c7f4f901b146a5edb85507f788

General

Target

setup_installer.exe
Size

4.3MB
MD5

5de2818ced29a1fedb9b24c1044ebd45
SHA1

c4ba9e1456ae58f25ae8d0d63cf192aa2a8bb506
SHA256

6a9a3047c827fcd99d8a97668337ca2d7af78b3b634e73e2461e8429e264c7e2
SHA512

9e43a56af0c2a3deac9528b1805f9ee00958c018194b4297149f3bd34fa9be81a133c6592a961d9f4989cbeb5436d2b764e8fc3f7a4410be676a40faf46a2656
SSDEEP

98304:xwCvLUBsgDAFcgEYkZPc8PA34Ztu6dh1VwE3soCHeEGdnmX:xNLUCgDAOgEYkZPDAIZtu6dh1p3sveEb

Score

10^/10

nullmixer aspackv2 dropper

Malware Config

Extracted

Family

nullmixer

C2

http://estrix.xyz/

Signatures

NullMixer
NullMixer is a malware dropper leading to an infection chain of a wide variety of malware families.
dropper nullmixer

ASPack v2.12-2.42 4 IoCs

Detects executables packed with ASPack v2.12-2.42

aspackv2

resource	yara_rule
behavioral4/files/0x000700000002333f-30.dat	aspack_v212_v242
behavioral4/files/0x000800000002332e-38.dat	aspack_v212_v242
behavioral4/files/0x0007000000023335-47.dat	aspack_v212_v242
behavioral4/files/0x0008000000023333-40.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-1-5-21-817259280-2658881748-983986378-1000\Control Panel\International\Geo\Nation	setup_installer.exe

Executes dropped EXE 1 IoCs

pid	Process
4208	setup_install.exe

Loads dropped DLL 6 IoCs

pid	Process
4208	setup_install.exe
4208	setup_install.exe
4208	setup_install.exe
4208	setup_install.exe
4208	setup_install.exe
4208	setup_install.exe

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
2836	4208	WerFault.exe	97

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1884 wrote to memory of 4208	1884	setup_installer.exe	97
PID 1884 wrote to memory of 4208	1884	setup_installer.exe	97
PID 1884 wrote to memory of 4208	1884	setup_installer.exe	97

C:\Users\Admin\AppData\Local\Temp\setup_installer.exe
"C:\Users\Admin\AppData\Local\Temp\setup_installer.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1884
- C:\Users\Admin\AppData\Local\Temp\7zSC574C947\setup_install.exe
  "C:\Users\Admin\AppData\Local\Temp\7zSC574C947\setup_install.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:4208
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4208 -s 492
    3⤵
    - Program crash
    PID:2836

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4208 -ip 4208
1⤵
PID:3556

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4084 --field-trial-handle=2276,i,5672504106535478802,17394903851940863593,262144 --variations-seed-version /prefetch:8
1⤵
PID:4356

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 Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7zSC574C947\libcurl.dll

Filesize
218KB

MD5
d09be1f47fd6b827c81a4812b4f7296f

SHA1
028ae3596c0790e6d7f9f2f3c8e9591527d267f7

SHA256
0de53e7be51789adaec5294346220b20f793e7f8d153a3c110a92d658760697e

SHA512
857f44a1383c29208509b8f1164b6438d750d5bb4419add7626986333433e67a0d1211ec240ce9472f30a1f32b16c8097aceba4b2255641b3d8928f94237f595

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zSC574C947\libcurlpp.dll

Filesize
54KB

MD5
e6e578373c2e416289a8da55f1dc5e8e

SHA1
b601a229b66ec3d19c2369b36216c6f6eb1c063e

SHA256
43e86d650a68f1f91fa2f4375aff2720e934aa78fa3d33e06363122bf5a9535f

SHA512
9df6a8c418113a77051f6cb02745ad48c521c13cdadb85e0e37f79e29041464c8c7d7ba8c558fdd877035eb8475b6f93e7fc62b38504ddfe696a61480cabac89

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zSC574C947\libgcc_s_dw2-1.dll

Filesize
113KB

MD5
9aec524b616618b0d3d00b27b6f51da1

SHA1
64264300801a353db324d11738ffed876550e1d3

SHA256
59a466f77584438fc3abc0f43edc0fc99d41851726827a008841f05cfe12da7e

SHA512
0648a26940e8f4aad73b05ad53e43316dd688e5d55e293cce88267b2b8744412be2e0d507dadad830776bf715bcd819f00f5d1f7ac1c5f1c4f682fb7457a20d0

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zSC574C947\libstdc++-6.dll

Filesize
647KB

MD5
5e279950775baae5fea04d2cc4526bcc

SHA1
8aef1e10031c3629512c43dd8b0b5d9060878453

SHA256
97de47068327bb822b33c7106f9cbb489480901a6749513ef5c31d229dcaca87

SHA512
666325e9ed71da4955058aea31b91e2e848be43211e511865f393b7f537c208c6b31c182f7d728c2704e9fc87e7d1be3f98f5fee4d34f11c56764e1c599afd02

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zSC574C947\libwinpthread-1.dll

Filesize
69KB

MD5
1e0d62c34ff2e649ebc5c372065732ee

SHA1
fcfaa36ba456159b26140a43e80fbd7e9d9af2de

SHA256
509cb1d1443b623a02562ac760bced540e327c65157ffa938a22f75e38155723

SHA512
3653f8ed8ad3476632f731a3e76c6aae97898e4bf14f70007c93e53bc443906835be29f861c4a123db5b11e0f3dd5013b2b3833469a062060825df9ee708dc61

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zSC574C947\setup_install.exe

Filesize
291KB

MD5
58efaf6fa04a8d7201ab19170785ce85

SHA1
744fe9d15bbdcafaf9be6f75ccba5e25c5e98fe8

SHA256
a0bbbc6603b16c0178e8e9ae86d5aa39686e7a3f084e0b82d7633bbb0cbcce92

SHA512
a346f5bccdfed715c416503a417187f23219db2f7854849dd6bdee14be9b7cab1d08b49e7b634db074c19e8b32f4c20f8f14d3022eca72ea2bb7476fa026d362

Download Submit
memory/4208-56-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/4208-58-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/4208-52-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/4208-54-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/4208-55-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/4208-49-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/4208-48-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/4208-50-0x0000000064940000-0x0000000064959000-memory.dmp

Filesize
100KB

Download
memory/4208-51-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/4208-43-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/4208-34-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-57-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download
memory/4208-59-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/4208-53-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/4208-60-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-61-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-62-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-63-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-64-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-65-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-66-0x0000000000400000-0x000000000051D000-memory.dmp

Filesize
1.1MB

Download
memory/4208-67-0x000000006B440000-0x000000006B4CF000-memory.dmp

Filesize
572KB

Download
memory/4208-68-0x000000006B280000-0x000000006B2A6000-memory.dmp

Filesize
152KB

Download
memory/4208-69-0x0000000064940000-0x0000000064959000-memory.dmp

Filesize
100KB

Download
memory/4208-70-0x000000006EB40000-0x000000006EB63000-memory.dmp

Filesize
140KB

Download
memory/4208-71-0x000000006FE40000-0x000000006FFC6000-memory.dmp

Filesize
1.5MB

Download

Analysis

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