ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18

Analysis

max time kernel
170s
max time network
178s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
03-12-2022 23:11

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General

Target

ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe
Size

213KB
MD5

0949d4dafbf6bbfa8bbedcd1016272a7
SHA1

bad56c5ff82bafa4ec3639dbab68ac5fc6fc69ee
SHA256

ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18
SHA512

c833f9ffbc6410d9115dc7a93ad18df44239b35dd448298179e97437486ff05c48a0e536c4506ea66819532c2f525b17a8f312b514491a0a9a524538400ada44
SSDEEP

6144:E/0uosDAv8QMGQ1LWvPEPIAdR12FNfL1L:EJDDAv8QMjwkPhYf

Score

8^/10

persistence upx

Malware Config

Signatures

Executes dropped EXE 3 IoCs

pid	Process
2612	×¢²á±í~1.EXE
3796	AssistRegCleaner.exe
2380	web.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0009000000022e41-141.dat	upx
behavioral2/files/0x0009000000022e41-143.dat	upx
behavioral2/memory/2380-142-0x0000000000400000-0x0000000000410000-memory.dmp	upx
behavioral2/memory/2380-147-0x0000000000400000-0x0000000000410000-memory.dmp	upx

Checks computer location settings 2 TTPs 2 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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	×¢²á±í~1.EXE
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	web.exe

Loads dropped DLL 1 IoCs

pid	Process
3796	AssistRegCleaner.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File created	C:\Windows\__tmp_rar_sfx_access_check_240588953	×¢²á±í~1.EXE
File created	C:\Windows\AssistRegCleaner.exe	×¢²á±í~1.EXE
File opened for modification	C:\Windows\AssistRegCleaner.exe	×¢²á±í~1.EXE
File created	C:\Windows\TweakAssistKrnl.dll	×¢²á±í~1.EXE
File opened for modification	C:\Windows\TweakAssistKrnl.dll	×¢²á±í~1.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
2388	PING.EXE

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3796	AssistRegCleaner.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3796	AssistRegCleaner.exe
3796	AssistRegCleaner.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5016 wrote to memory of 2612	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	84
PID 5016 wrote to memory of 2612	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	84
PID 5016 wrote to memory of 2612	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	84
PID 2612 wrote to memory of 3796	2612	×¢²á±í~1.EXE	85
PID 2612 wrote to memory of 3796	2612	×¢²á±í~1.EXE	85
PID 2612 wrote to memory of 3796	2612	×¢²á±í~1.EXE	85
PID 5016 wrote to memory of 2380	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	86
PID 5016 wrote to memory of 2380	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	86
PID 5016 wrote to memory of 2380	5016	ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe	86
PID 2380 wrote to memory of 364	2380	web.exe	87
PID 2380 wrote to memory of 364	2380	web.exe	87
PID 2380 wrote to memory of 364	2380	web.exe	87
PID 364 wrote to memory of 2388	364	cmd.exe	90
PID 364 wrote to memory of 2388	364	cmd.exe	90
PID 364 wrote to memory of 2388	364	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe
"C:\Users\Admin\AppData\Local\Temp\ef9232ca6e23d0dc056bc921ee1d5d07bf5998d23c8cb6b69a2a054019a9ad18.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:5016
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\×¢²á±í~1.EXE
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\×¢²á±í~1.EXE
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Drops file in Windows directory
  - Suspicious use of WriteProcessMemory
  PID:2612
- - C:\Windows\AssistRegCleaner.exe
    "C:\Windows\AssistRegCleaner.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:3796
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\web.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\web.exe
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:2380
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\3BF0.tmp\web.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:364
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 600
      4⤵
      Runs ping.exe
      PID:2388

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

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\3BF0.tmp\web.bat

Filesize
1KB

MD5
fda3e25a1ee4d7f053004df89a2c986c

SHA1
866b58b545e1e029ed948b35a666a49e386e4eca

SHA256
01dfe302ef72c7df11dece3a9fcfdbf5f1da21fa8d2003fd17b3fb8f1e7936cb

SHA512
7b258ee1d60c6825c4cacea80a2906b6ed5d7d04961efea8e079478d2b95dd55b960bb0478c3731bb9f41372710655467292ea1bda116d7ea3daf13584038ac8

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\web.exe

Filesize
21KB

MD5
25c32f16fc416fb33ce0db91d23a2b50

SHA1
00cd581f37c5427445f7b5b95f8ffba5a558038c

SHA256
6f3b3f992a7877ee57889fd092e7d58c8840fcef8ba08c167f7664995c3d10dd

SHA512
6fc402ae076bfe58275bbcc7509baf7559a627850352237521c2f020724f02376357b3d97da17643a451153186074651feca338eae7f9f58c698c31f2c5f9584

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\web.exe

Filesize
21KB

MD5
25c32f16fc416fb33ce0db91d23a2b50

SHA1
00cd581f37c5427445f7b5b95f8ffba5a558038c

SHA256
6f3b3f992a7877ee57889fd092e7d58c8840fcef8ba08c167f7664995c3d10dd

SHA512
6fc402ae076bfe58275bbcc7509baf7559a627850352237521c2f020724f02376357b3d97da17643a451153186074651feca338eae7f9f58c698c31f2c5f9584

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\×¢²á±í~1.EXE

Filesize
188KB

MD5
002aaee3c65562e7b9aa42abada9ef83

SHA1
ec2855ed55824f8cb03108b449fbc79fdd39083d

SHA256
23db036919cff1e038926d68086beea9d5c14a6b9e9504706a37791ce43fcdb8

SHA512
feacd408f9ccab3283933b7600483a3dc1f533c8e181d86c467e267d07db9fb7d60426129480936b10bdb3235d6752f99e7c9eb3a40e78db277e689d80374db5

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\×¢²á±í~1.EXE

Filesize
188KB

MD5
002aaee3c65562e7b9aa42abada9ef83

SHA1
ec2855ed55824f8cb03108b449fbc79fdd39083d

SHA256
23db036919cff1e038926d68086beea9d5c14a6b9e9504706a37791ce43fcdb8

SHA512
feacd408f9ccab3283933b7600483a3dc1f533c8e181d86c467e267d07db9fb7d60426129480936b10bdb3235d6752f99e7c9eb3a40e78db277e689d80374db5

Download Submit
C:\Windows\AssistRegCleaner.exe

Filesize
200KB

MD5
3793e2739f0de9dc8ee7b7bb5f65545d

SHA1
f4fe26b6f618656fa95438219b68e49a5fa476f4

SHA256
df0b0ccde23dce4afa0cd46c7101172764cd979c20f91ede12eff30649aa16c3

SHA512
b1cf7be8fb44468746346801f1d957ca67b17ce20e4815c5f2cefc7aaf1914701ef581ce2931bb710972a982446cf825ff0b8a4afc38e293b22925785dd27ee4

Download Submit
C:\Windows\AssistRegCleaner.exe

Filesize
200KB

MD5
3793e2739f0de9dc8ee7b7bb5f65545d

SHA1
f4fe26b6f618656fa95438219b68e49a5fa476f4

SHA256
df0b0ccde23dce4afa0cd46c7101172764cd979c20f91ede12eff30649aa16c3

SHA512
b1cf7be8fb44468746346801f1d957ca67b17ce20e4815c5f2cefc7aaf1914701ef581ce2931bb710972a982446cf825ff0b8a4afc38e293b22925785dd27ee4

Download Submit
C:\Windows\TweakAssistKrnl.dll

Filesize
32KB

MD5
02c64a1386500a910ab7b836e2ba7e2d

SHA1
0f37a01560159f681cd00f8e7a40fbf8c59c6eef

SHA256
87ab75eeef60e1d01bef16a41fd6d4f8bb8defad8615a9943d01b8d935b6e54e

SHA512
4230ddf7690541ebc3a1554f1cacc19167235df261723236d7dca19539e5c11e5ffaad88fb8dc9cb63fc7f0f87b8f9f33516ec9b1d4f841fa24f59e825081f99

Download Submit
C:\Windows\TweakAssistKrnl.dll

Filesize
32KB

MD5
02c64a1386500a910ab7b836e2ba7e2d

SHA1
0f37a01560159f681cd00f8e7a40fbf8c59c6eef

SHA256
87ab75eeef60e1d01bef16a41fd6d4f8bb8defad8615a9943d01b8d935b6e54e

SHA512
4230ddf7690541ebc3a1554f1cacc19167235df261723236d7dca19539e5c11e5ffaad88fb8dc9cb63fc7f0f87b8f9f33516ec9b1d4f841fa24f59e825081f99

Download Submit
memory/364-144-0x0000000000000000-mapping.dmp

Download
memory/2380-140-0x0000000000000000-mapping.dmp

Download
memory/2380-142-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2380-147-0x0000000000400000-0x0000000000410000-memory.dmp

Filesize
64KB

Download
memory/2388-146-0x0000000000000000-mapping.dmp

Download
memory/2612-132-0x0000000000000000-mapping.dmp

Download
memory/3796-135-0x0000000000000000-mapping.dmp

Download