Analysis
-
max time kernel
147s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
01-02-2023 06:34
Static task
static1
Behavioral task
behavioral1
Sample
MSVCR71.DLL.dll
Resource
win7-20220901-en
General
-
Target
MSVCR71.DLL.dll
-
Size
400KB
-
MD5
f90aa1c4d54dafde1b4359293eda3f52
-
SHA1
10d781593ec6c3ea1780d887d2ad73a296bc0b23
-
SHA256
7ea73b4aa5cc6aee461f0f0a961aa8a9ff16ed09a82d039ff1136e8c23c41820
-
SHA512
d3ce7b811cf778584a4ee590bbeb7693bdc43c8acccaa77a433eaea18e5f77066f59eb54890d2fe7d270b3493e8a8077236786d362bf8fea0ef3cfd1a537ad7f
-
SSDEEP
6144:ccV9z83OtqxnEYmt3NEnvfF+Tbmbw6An8FMciFMNrb3YgxxpbCAOxO2ElvlEzn:coz83OtIEzW+/m/AyF7bCrO/Ej
Malware Config
Signatures
-
Executes dropped EXE 2 IoCs
Processes:
rundll32Srv.exeDesktopLayer.exepid process 4764 rundll32Srv.exe 1500 DesktopLayer.exe -
Processes:
resource yara_rule C:\Windows\SysWOW64\rundll32Srv.exe upx C:\Windows\SysWOW64\rundll32Srv.exe upx C:\Program Files (x86)\Microsoft\DesktopLayer.exe upx C:\Program Files (x86)\Microsoft\DesktopLayer.exe upx behavioral2/memory/4764-138-0x0000000000400000-0x000000000042E000-memory.dmp upx behavioral2/memory/1500-140-0x0000000000400000-0x000000000042E000-memory.dmp upx -
Drops file in System32 directory 1 IoCs
Processes:
rundll32.exedescription ioc process File created C:\Windows\SysWOW64\rundll32Srv.exe rundll32.exe -
Drops file in Program Files directory 3 IoCs
Processes:
rundll32Srv.exedescription ioc process File opened for modification C:\Program Files (x86)\Microsoft\pxDD55.tmp rundll32Srv.exe File created C:\Program Files (x86)\Microsoft\DesktopLayer.exe rundll32Srv.exe File opened for modification C:\Program Files (x86)\Microsoft\DesktopLayer.exe rundll32Srv.exe -
Program crash 1 IoCs
Processes:
WerFault.exepid pid_target process target process 1468 4840 WerFault.exe rundll32.exe -
Processes:
iexplore.exeIEXPLORE.EXEdescription ioc process Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Main IEXPLORE.EXE Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLLowDateTime = "1251635200" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\AdminActive\{D1CE6EC6-A202-11ED-AECB-4A8324823CC0} = "0" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FullScreen = "no" iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\DomainSuggestion iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateLowDateTime = "2800876151" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastUpdateHighDateTime = "31012367" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\VersionManager IEXPLORE.EXE Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "31012367" IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\ iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\VersionManager iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastTTLHighDateTime = "50" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2800876151" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "31012367" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames\ iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "382001829" iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2833062215" IEXPLORE.EXE Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Internet Explorer\DomainSuggestion\FileNames iexplore.exe -
Suspicious behavior: EnumeratesProcesses 8 IoCs
Processes:
DesktopLayer.exepid process 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe 1500 DesktopLayer.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
Processes:
iexplore.exepid process 548 iexplore.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
iexplore.exepid process 548 iexplore.exe -
Suspicious use of SetWindowsHookEx 6 IoCs
Processes:
iexplore.exeIEXPLORE.EXEpid process 548 iexplore.exe 548 iexplore.exe 2544 IEXPLORE.EXE 2544 IEXPLORE.EXE 2544 IEXPLORE.EXE 2544 IEXPLORE.EXE -
Suspicious use of WriteProcessMemory 14 IoCs
Processes:
rundll32.exerundll32.exerundll32Srv.exeDesktopLayer.exeiexplore.exedescription pid process target process PID 4984 wrote to memory of 4840 4984 rundll32.exe rundll32.exe PID 4984 wrote to memory of 4840 4984 rundll32.exe rundll32.exe PID 4984 wrote to memory of 4840 4984 rundll32.exe rundll32.exe PID 4840 wrote to memory of 4764 4840 rundll32.exe rundll32Srv.exe PID 4840 wrote to memory of 4764 4840 rundll32.exe rundll32Srv.exe PID 4840 wrote to memory of 4764 4840 rundll32.exe rundll32Srv.exe PID 4764 wrote to memory of 1500 4764 rundll32Srv.exe DesktopLayer.exe PID 4764 wrote to memory of 1500 4764 rundll32Srv.exe DesktopLayer.exe PID 4764 wrote to memory of 1500 4764 rundll32Srv.exe DesktopLayer.exe PID 1500 wrote to memory of 548 1500 DesktopLayer.exe iexplore.exe PID 1500 wrote to memory of 548 1500 DesktopLayer.exe iexplore.exe PID 548 wrote to memory of 2544 548 iexplore.exe IEXPLORE.EXE PID 548 wrote to memory of 2544 548 iexplore.exe IEXPLORE.EXE PID 548 wrote to memory of 2544 548 iexplore.exe IEXPLORE.EXE
Processes
-
C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\MSVCR71.DLL.dll,#11⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\MSVCR71.DLL.dll,#12⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\rundll32Srv.exeC:\Windows\SysWOW64\rundll32Srv.exe3⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Microsoft\DesktopLayer.exe"C:\Program Files (x86)\Microsoft\DesktopLayer.exe"4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Program Files\Internet Explorer\iexplore.exe"C:\Program Files\Internet Explorer\iexplore.exe"5⤵
- Modifies Internet Explorer settings
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:548 CREDAT:17410 /prefetch:26⤵
- Modifies Internet Explorer settings
- Suspicious use of SetWindowsHookEx
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4840 -s 6083⤵
- Program crash
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4840 -ip 48401⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
-
C:\Program Files (x86)\Microsoft\DesktopLayer.exeFilesize
55KB
MD5ff5e1f27193ce51eec318714ef038bef
SHA1b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6
SHA256fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320
SHA512c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a
-
C:\Program Files (x86)\Microsoft\DesktopLayer.exeFilesize
55KB
MD5ff5e1f27193ce51eec318714ef038bef
SHA1b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6
SHA256fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320
SHA512c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776Filesize
471B
MD5415f2185a9c64b830e7558bce25207be
SHA15b9087daa5a7c1b42fa0d84b25de64ecc9ab335b
SHA2569845be82fb85d04acc616713931ce35e21b76fb6bd0c76945417c9377200607b
SHA512a6385a6c7a0c8eb7f4dc5dbaba72d34e921ece1bda233687a38520b10fdb1a1451339ff6a4e63e6ce3840dfeadaf01e2d95cc01554830f88811989a814ccfbac
-
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\7423F88C7F265F0DEFC08EA88C3BDE45_AA1E8580D4EBC816148CE81268683776Filesize
404B
MD5d7e54cab5d073b964fc572245d2df0c8
SHA1b0f16d3b8edf10c77e157f9bafee7fd26651f30e
SHA2561285bcbd99776145729c087d631a77bd336fd9062365e1062e007343de369438
SHA512d1451ce4bfa490f749c6b245e361a1aaa0269ef7e192acf7dc0ef387ab05049f9bdd94892b7a39b12337d13c9c75d57ff2052dd4f090394fd4361ef23c8f3273
-
C:\Windows\SysWOW64\rundll32Srv.exeFilesize
55KB
MD5ff5e1f27193ce51eec318714ef038bef
SHA1b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6
SHA256fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320
SHA512c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a
-
C:\Windows\SysWOW64\rundll32Srv.exeFilesize
55KB
MD5ff5e1f27193ce51eec318714ef038bef
SHA1b4fa74a6f4dab3a7ba702b6c8c129f889db32ca6
SHA256fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320
SHA512c9d654ead35f40eea484a3dc5b5d0a44294b9e7b41a9bacdafdd463d3de9daa2a43237a5f113f6a9c8ea5e1366823fd3d83da18cd8197aa69a55e9f345512a7a
-
memory/1500-136-0x0000000000000000-mapping.dmp
-
memory/1500-140-0x0000000000400000-0x000000000042E000-memory.dmpFilesize
184KB
-
memory/4764-133-0x0000000000000000-mapping.dmp
-
memory/4764-138-0x0000000000400000-0x000000000042E000-memory.dmpFilesize
184KB
-
memory/4840-132-0x0000000000000000-mapping.dmp
-
memory/4840-141-0x000000007C340000-0x000000007C3A5000-memory.dmpFilesize
404KB