Analysis Overview
SHA256
47ba6b08c23ebfa7813dcd10cebe93876e7c972718151a018b11ff51085c4382
Threat Level: Known bad
The file SilverClient.exe was found to be: Known bad.
Malicious Activity Summary
StormKitty payload
StormKitty
Sets file to hidden
Executes dropped EXE
Drops startup file
Legitimate hosting services abused for malware hosting/C2
Adds Run key to start application
Drops desktop.ini file(s)
Sets desktop wallpaper using registry
Unsigned PE
Enumerates physical storage devices
Uses Task Scheduler COM API
Modifies registry class
Suspicious use of WriteProcessMemory
Creates scheduled task(s)
Views/modifies file attributes
Suspicious behavior: EnumeratesProcesses
Suspicious use of SendNotifyMessage
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious behavior: AddClipboardFormatListener
Delays execution with timeout.exe
Suspicious behavior: GetForegroundWindowSpam
MITRE ATT&CK Matrix V13
Analysis: static1
Detonation Overview
Reported
2024-04-28 03:29
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-04-28 03:29
Reported
2024-04-28 03:48
Platform
win10-20240404-en
Max time kernel
581s
Max time network
866s
Command Line
Signatures
StormKitty
StormKitty payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Sets file to hidden
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\attrib.exe | N/A |
| N/A | N/A | C:\Windows\System32\attrib.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\YOUR FILES HAS BEEN ENCRYPTED!!!.txt | C:\Users\Admin\UserProfile\$77svchost.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\UserProfile\$77svchost.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\UserProfile\\$77svchost.exe\"" | C:\Users\Admin\AppData\Local\Temp\SilverClient.exe | N/A |
Drops desktop.ini file(s)
| Description | Indicator | Process | Target |
| File opened for modification | \??\c:\users\admin\downloads\desktop.ini | C:\Users\Admin\UserProfile\$77svchost.exe | N/A |
Legitimate hosting services abused for malware hosting/C2
| Description | Indicator | Process | Target |
| N/A | discord.com | N/A | N/A |
| N/A | discord.com | N/A | N/A |
Sets desktop wallpaper using registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1687926120-3022217735-1146543763-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\BHlMMJJGED.jpg" | C:\Users\Admin\UserProfile\$77svchost.exe | N/A |
Enumerates physical storage devices
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SYSTEM32\schtasks.exe | N/A |
| N/A | N/A | C:\Windows\System32\schtasks.exe | N/A |
Delays execution with timeout.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\timeout.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-1687926120-3022217735-1146543763-1000_Classes\Local Settings | C:\Users\Admin\UserProfile\$77svchost.exe | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\VideoLAN\VLC\vlc.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Views/modifies file attributes
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\attrib.exe | N/A |
| N/A | N/A | C:\Windows\System32\attrib.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
C:\Windows\System32\attrib.exe
"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\UserProfile"
C:\Windows\System32\attrib.exe
"C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\UserProfile\$77svchost.exe"
C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB594.tmp.bat""
C:\Windows\system32\timeout.exe
timeout 3
C:\Users\Admin\UserProfile\$77svchost.exe
"C:\Users\Admin\UserProfile\$77svchost.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks.exe" /query /TN $77svchost.exe
C:\Windows\SYSTEM32\schtasks.exe
"schtasks.exe" /Create /SC ONCE /TN "$77svchost.exe" /TR "C:\Users\Admin\UserProfile\$77svchost.exe \"\$77svchost.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
C:\Windows\SYSTEM32\schtasks.exe
"schtasks.exe" /query /TN $77svchost.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /sc daily /tn "svchost_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00
C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\YOUR FILES HAS BEEN ENCRYPTED!!!.txt
C:\Program Files\VideoLAN\VLC\vlc.exe
"C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\TestComplete.m4v"
C:\Windows\SYSTEM32\Cmd.exe
"Cmd"
C:\Windows\System32\WindowsPowerShell\v1.0\PowerShell.exe
"PowerShell"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | discord.com | udp |
| US | 162.159.137.232:443 | discord.com | tcp |
| US | 8.8.8.8:53 | choice-certainly.gl.at.ply.gg | udp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 232.137.159.162.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 19.221.185.147.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | 43.229.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.173.189.20.in-addr.arpa | udp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 8.8.8.8:53 | fast.com | udp |
| BE | 104.68.65.13:443 | fast.com | tcp |
| US | 8.8.8.8:53 | api.fast.com | udp |
| IE | 34.249.148.94:443 | api.fast.com | tcp |
| US | 8.8.8.8:53 | 13.65.68.104.in-addr.arpa | udp |
| IE | 34.249.148.94:443 | api.fast.com | tcp |
| US | 8.8.8.8:53 | 94.148.249.34.in-addr.arpa | udp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
| US | 147.185.221.19:24253 | choice-certainly.gl.at.ply.gg | tcp |
Files
memory/3188-0-0x0000000000F20000-0x0000000000F2E000-memory.dmp
memory/3188-1-0x00007FFF04D80000-0x00007FFF0576C000-memory.dmp
memory/3188-2-0x000000001CA50000-0x000000001CA60000-memory.dmp
memory/3188-4-0x00007FFF04D80000-0x00007FFF0576C000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\tmpB594.tmp.bat
| MD5 | 8d88e82f52cf8f1f1d616e864fb6924d |
| SHA1 | 050ee5fc9b565db20fadb71608f7c3b82ad32bde |
| SHA256 | cb726a8755e86adaf7b495a227ac7199a779c243cd4a3a6e859788b3820aa68c |
| SHA512 | 20c84ec49681fd2f839e83c3c80bfce1c78eb8b6bb0844c558739dbb13a1cbc9bb02120a9a2e2b685d680dca75f9e1018e9d5be74fd279f7c85441c9b8aa5fe0 |
memory/3188-9-0x00007FFF04D80000-0x00007FFF0576C000-memory.dmp
C:\Users\Admin\UserProfile\$77svchost.exe
| MD5 | fabd8535478bee89be312833f6089099 |
| SHA1 | e14e26e8f6d05929e9a24a3b523d0a8ec2535f11 |
| SHA256 | 47ba6b08c23ebfa7813dcd10cebe93876e7c972718151a018b11ff51085c4382 |
| SHA512 | 6b12403e742230504a543c7135b4a20af31be1c21649904463bd0cee00fd9e0e08953f0b854089619cc0abba96cd8f1831e4799f7dc81ab600529e3f3a00c04b |
memory/5044-17-0x000001B5BBD70000-0x000001B5BBD92000-memory.dmp
memory/5044-20-0x000001B5BC0A0000-0x000001B5BC116000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cykgxcwd.q3t.ps1
| MD5 | c4ca4238a0b923820dcc509a6f75849b |
| SHA1 | 356a192b7913b04c54574d18c28d46e6395428ab |
| SHA256 | 6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b |
| SHA512 | 4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a |
memory/5060-68-0x00000000036E0000-0x0000000003700000-memory.dmp
memory/5060-69-0x00000000016A0000-0x0000000001826000-memory.dmp
memory/5060-70-0x0000000001870000-0x000000000189A000-memory.dmp
memory/5060-71-0x00000000018A0000-0x00000000018AE000-memory.dmp
memory/3000-88-0x00007FF7F9650000-0x00007FF7F9748000-memory.dmp
memory/3000-89-0x00007FFF19D10000-0x00007FFF19D44000-memory.dmp
memory/3000-90-0x00007FFF004A0000-0x00007FFF00756000-memory.dmp
memory/3000-91-0x000001D74D970000-0x000001D74EA20000-memory.dmp
memory/5060-92-0x00000000018C0000-0x00000000018D0000-memory.dmp
memory/5060-93-0x0000000000010000-0x0000000000066000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\PowerShell.exe.log
| MD5 | 8592ba100a78835a6b94d5949e13dfc1 |
| SHA1 | 63e901200ab9a57c7dd4c078d7f75dcd3b357020 |
| SHA256 | fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c |
| SHA512 | 87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3 |
memory/856-128-0x00000243ED4B0000-0x00000243ED4EC000-memory.dmp