Analysis Overview
SHA256
a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979
Threat Level: Likely malicious
The file a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979 was found to be: Likely malicious.
Malicious Activity Summary
Detects executables containing base64 encoded User Agent
Blocklisted process makes network request
ASPack v2.12-2.42
Loads dropped DLL
Executes dropped EXE
Reads user/profile data of web browsers
Deletes itself
Adds Run key to start application
Writes to the Master Boot Record (MBR)
Enumerates connected drives
Unsigned PE
Runs ping.exe
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Checks processor information in registry
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-05-16 01:42
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-05-16 01:42
Reported
2024-05-16 01:44
Platform
win7-20240508-en
Max time kernel
149s
Max time network
151s
Command Line
Signatures
Detects executables containing base64 encoded User Agent
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Blocklisted process makes network request
| Description | Indicator | Process | Target |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
ASPack v2.12-2.42
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\ymkhc.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\ymkhc.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Reads user/profile data of web browsers
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-268080393-3149932598-1824759070-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\txfsq\\ztdrcwxs.trz\",SHA1" | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Enumerates connected drives
| Description | Indicator | Process | Target |
| File opened (read-only) | \??\z: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\e: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\h: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\m: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\t: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\n: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\o: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\q: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\r: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\a: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\i: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\j: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\l: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\y: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\b: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\k: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\w: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\v: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\x: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\g: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\p: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\s: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\u: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Writes to the Master Boot Record (MBR)
| Description | Indicator | Process | Target |
| File opened for modification | \??\PHYSICALDRIVE0 | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\PING.EXE | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\ymkhc.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe
"C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
C:\Windows\SysWOW64\cmd.exe
cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\ymkhc.exe "C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1 -n 2
C:\Users\Admin\AppData\Local\Temp\ymkhc.exe
C:\Users\Admin\AppData\Local\Temp\\ymkhc.exe "C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
\??\c:\windows\SysWOW64\rundll32.exe
c:\windows\system32\rundll32.exe "c:\txfsq\ztdrcwxs.trz",SHA1 C:\Users\Admin\AppData\Local\Temp\ymkhc.exe
Network
| Country | Destination | Domain | Proto |
| US | 107.163.241.193:16300 | tcp | |
| US | 107.163.241.193:16300 | tcp | |
| US | 107.163.241.194:6520 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.194:6520 | tcp | |
| US | 107.163.241.194:6520 | tcp | |
| US | 107.163.241.194:6520 | tcp |
Files
C:\Users\Admin\AppData\Local\Temp\ymkhc.exe
| MD5 | 5e0dec23ae6bfcfe5c2527bc5be00ec1 |
| SHA1 | 61dc8f71019d941bf1ba015128c1d361d43609c9 |
| SHA256 | 191457169461c871319ed2f012e64fd35c96b2b56c6b563e09f1eaf7fab92818 |
| SHA512 | 2cc922c896eb9b8a08d9871223a1798021afaa27b43d00f7d563157862bd8c070bcde44872a82a88434c9aff579aae697d40dd9cbc16941c16eaf1b86f5b8d21 |
\??\c:\txfsq\ztdrcwxs.trz
| MD5 | 4993bd7ca91574843d5a608c532151a4 |
| SHA1 | 72ff0d8e4ccee88738b3ab8bdb52b9474e0ef55e |
| SHA256 | 489855558b5a997477f7c95a05e7adcbf6001e06bd80e29b01fdabdb006cdbbb |
| SHA512 | 13418193723dace324d5b91a8162a09521640bc6e401c841bb0644de8ec9a762912f2afd588be8845a30b2f59ac10ab2eaa0b356068d1503792a30a826ed075c |
memory/2240-8-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-9-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-11-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-12-0x0000000010024000-0x0000000010025000-memory.dmp
memory/2240-10-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-13-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-17-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-18-0x0000000010000000-0x0000000010027000-memory.dmp
memory/2240-19-0x0000000010000000-0x0000000010027000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-05-16 01:42
Reported
2024-05-16 01:44
Platform
win10v2004-20240508-en
Max time kernel
149s
Max time network
153s
Command Line
Signatures
Detects executables containing base64 encoded User Agent
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Blocklisted process makes network request
| Description | Indicator | Process | Target |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
ASPack v2.12-2.42
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\jpfpb.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\jpfpb.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Reads user/profile data of web browsers
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\wvbph\\okemk.kmo\",SHA1" | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Enumerates connected drives
| Description | Indicator | Process | Target |
| File opened (read-only) | \??\a: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\b: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\j: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\k: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\o: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\q: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\u: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\e: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\g: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\l: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\m: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\p: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\t: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\h: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\v: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\x: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\y: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\z: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\i: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\n: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\r: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\s: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| File opened (read-only) | \??\w: | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Writes to the Master Boot Record (MBR)
| Description | Indicator | Process | Target |
| File opened for modification | \??\PHYSICALDRIVE0 | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\PING.EXE | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | \??\c:\windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\jpfpb.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe
"C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
C:\Windows\SysWOW64\cmd.exe
cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\jpfpb.exe "C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1 -n 2
C:\Users\Admin\AppData\Local\Temp\jpfpb.exe
C:\Users\Admin\AppData\Local\Temp\\jpfpb.exe "C:\Users\Admin\AppData\Local\Temp\a4b5ffd094143464cf7ba4df59bc6e60e09b03450d22cbdf1d3cb29dcf929979.exe"
\??\c:\windows\SysWOW64\rundll32.exe
c:\windows\system32\rundll32.exe "c:\wvbph\okemk.kmo",SHA1 C:\Users\Admin\AppData\Local\Temp\jpfpb.exe
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.237:443 | g.bing.com | tcp |
| NL | 23.62.61.194:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| NL | 23.62.61.194:443 | www.bing.com | tcp |
| US | 8.8.8.8:53 | 237.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 194.61.62.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 71.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 43.58.199.20.in-addr.arpa | udp |
| US | 107.163.241.193:16300 | tcp | |
| US | 107.163.241.194:6520 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.195:12354 | tcp | |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 107.163.241.195:12354 | tcp | |
| US | 107.163.241.194:6520 | tcp | |
| US | 8.8.8.8:53 | 79.190.18.2.in-addr.arpa | udp |
| US | 107.163.241.194:6520 | tcp | |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 57.169.31.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 200.197.79.204.in-addr.arpa | udp |
| US | 107.163.241.194:6520 | tcp |
Files
C:\Users\Admin\AppData\Local\Temp\jpfpb.exe
| MD5 | 1661a6ae30c086e5ac595403004ec93e |
| SHA1 | f206c4054940f0e61b91543f100298a046c404a1 |
| SHA256 | bee963fe577135a2ce91d09638953fb6989966373d85823bf5d2fb0294b04193 |
| SHA512 | 4e42d639aee2dd8af886c0f7b1e0ee07573d5b36186d7646af31dc51861c6cfc1dbf8270f2647c35f619753f0f4e2f69b5c995c531d2c46388fd6459634d00a2 |
\??\c:\wvbph\okemk.kmo
| MD5 | 4993bd7ca91574843d5a608c532151a4 |
| SHA1 | 72ff0d8e4ccee88738b3ab8bdb52b9474e0ef55e |
| SHA256 | 489855558b5a997477f7c95a05e7adcbf6001e06bd80e29b01fdabdb006cdbbb |
| SHA512 | 13418193723dace324d5b91a8162a09521640bc6e401c841bb0644de8ec9a762912f2afd588be8845a30b2f59ac10ab2eaa0b356068d1503792a30a826ed075c |
memory/1172-7-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-9-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-10-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-8-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-11-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-13-0x0000000010000000-0x0000000010027000-memory.dmp
memory/1172-15-0x0000000010000000-0x0000000010027000-memory.dmp