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Windows
Analysis Report
TMSSetup.exe
Overview
General Information
Detection
Score: | 68 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Multi AV Scanner detection for submitted file
System process connects to network (likely due to code injection or exploit)
Contain functionality to detect virtual machines
PE file contains section with special chars
Yara detected Generic Downloader
Abnormal high CPU Usage
Allocates memory with a write watch (potentially for evading sandboxes)
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to check if a debugger is running (OutputDebugString,GetLastError)
Contains functionality to download and execute PE files
Contains functionality to download and launch executables
Contains functionality to dynamically determine API calls
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to shutdown / reboot the system
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Drops PE files
Drops files with a non-matching file extension (content does not match file extension)
Extensive use of GetProcAddress (often used to hide API calls)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found dropped PE file which has not been started or loaded
Found evasive API chain checking for process token information
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
IP address seen in connection with other malware
Installs a raw input device (often for capturing keystrokes)
May sleep (evasive loops) to hinder dynamic analysis
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
PE / OLE file has an invalid certificate
PE file contains an invalid checksum
PE file contains executable resources (Code or Archives)
PE file contains sections with non-standard names
PE file does not import any functions
Queries information about the installed CPU (vendor, model number etc)
Queries keyboard layouts
Queries sensitive Operating System Information (via WMI, Win32_ComputerSystem, often done to detect virtual machines)
Queries the volume information (name, serial number etc) of a device
Registers a DLL
Sample file is different than original file name gathered from version info
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Classification
- System is w10x64
- TMSSetup.exe (PID: 7264 cmdline:
"C:\Users\ user\Deskt op\TMSSetu p.exe" MD5: E0EFCD15DAAA87D864F56C803156AE43) - rundll32.exe (PID: 7304 cmdline:
"C:\Window s\System32 \rundll32. exe" "C:\U sers\user\ AppData\Lo cal\Temp\C leanUp.dll ", Test MD5: EF3179D498793BF4234F708D3BE28633) - rundll32.exe (PID: 7320 cmdline:
"C:\Window s\System32 \rundll32. exe" "C:\U sers\user\ AppData\Lo cal\Temp\C leanUp.dll ", Test MD5: 889B99C52A60DD49227C5E485A016679) - MSTeamsSetup_c_l_.exe (PID: 7372 cmdline:
"C:\Users\ user\AppDa ta\Local\T emp\MSTeam sSetup_c_l _.exe" MD5: CF0E0F57B68A11D099EC944200A6069D)
- MSTeamsSetup_c_l_.exe (PID: 7408 cmdline:
"C:\Users\ user\AppDa ta\Local\T emp\MSTeam sSetup_c_l _.exe" --r erunningWi thoutUAC MD5: CF0E0F57B68A11D099EC944200A6069D) - Update.exe (PID: 7432 cmdline:
"C:\Users\ user\AppDa ta\Local\S quirrelTem p\Update.e xe" --inst all . --re runningWit houtUAC -- exeName=MS TeamsSetup _c_l_.exe --bootstra pperMode MD5: 8F0E958D7EF57D727ADCDA1C67C24C2B) - Squirrel.exe (PID: 7940 cmdline:
"C:\Users\ user\AppDa ta\Local\M icrosoft\T eams\curre nt\Squirre l.exe" --u pdateSelf= C:\Users\u ser\AppDat a\Local\Sq uirrelTemp \Update.ex e MD5: 17927E3240D3B0212A4B93C1D45F92B0) - Teams.exe (PID: 7920 cmdline:
"C:\Users\ user\AppDa ta\Local\M icrosoft\T eams\curre nt\Teams.e xe" --squi rrel-insta ll 1.7.00. 15969 MD5: E20A8E5630CFCAD496816E211D212EAC) - Teams.exe (PID: 2996 cmdline:
"C:\Users\ user\AppDa ta\Local\M icrosoft\T eams\curre nt\Teams.e xe" --squi rrel-first run MD5: E20A8E5630CFCAD496816E211D212EAC) - Teams.exe (PID: 2500 cmdline:
"C:\Users\ user\AppDa ta\Local\M icrosoft\T eams\curre nt\Teams.e xe" --type =gpu-proce ss --user- data-dir=" C:\Users\u ser\AppDat a\Roaming\ Microsoft\ Teams" --g pu-prefere nces=UAAAA AAAAADgAAA YAAAAAAAAA AAAAAAAAAB gAAAAAAAwA AAAAAAAAAA AAAAAAAAAA AAAAAAAAAA AAAAAAAAAA EgAAAAAAAA ASAAAAAAAA AAYAAAAAgA AABAAAAAAA AAAGAAAAAA AAAAQAAAAA AAAAAAAAAA OAAAAEAAAA AAAAAABAAA ADgAAAAgAA AAAAAAACAA AAAAAAAA= --mojo-pla tform-chan nel-handle =1700 --fi eld-trial- handle=190 0,i,432351 1078249520 092,101722 5939858592 0276,13107 2 --disabl e-features =SpareRend ererForSit ePerProces s,WinRetri eveSuggest ionsOnlyOn Demand /pr efetch:2 MD5: E20A8E5630CFCAD496816E211D212EAC) - Teams.exe (PID: 5232 cmdline:
"C:\Users\ user\AppDa ta\Local\M icrosoft\T eams\curre nt\Teams.e xe" --type =utility - -utility-s ub-type=ne twork.mojo m.NetworkS ervice --l ang=en-GB --service- sandbox-ty pe=none -- user-data- dir="C:\Us ers\user\A ppData\Roa ming\Micro soft\Teams " --mojo-p latform-ch annel-hand le=2156 -- field-tria l-handle=1 900,i,4323 5110782495 20092,1017 2259398585 920276,131 072 --disa ble-featur es=SpareRe ndererForS itePerProc ess,WinRet rieveSugge stionsOnly OnDemand / prefetch:8 MD5: E20A8E5630CFCAD496816E211D212EAC) - regsvr32.exe (PID: 652 cmdline:
"C:\Window s\system32 \regsvr32. exe" /s /n /i:user " C:\Users\u ser\AppDat a\Local\Mi crosoft\Te amsMeeting Addin\1.0. 24151.1\x6 4\Microsof t.Teams.Ad dinLoader. dll" MD5: 878E47C8656E53AE8A8A21E927C6F7E0) - regsvr32.exe (PID: 4936 cmdline:
/s /n /i: user "C:\U sers\user\ AppData\Lo cal\Micros oft\TeamsM eetingAddi n\1.0.2415 1.1\x64\Mi crosoft.Te ams.AddinL oader.dll" MD5: B0C2FA35D14A9FAD919E99D9D75E1B9E) - regsvr32.exe (PID: 2024 cmdline:
"C:\Window s\SysWOW64 \regsvr32. exe" /s /n /i:user " C:\Users\u ser\AppDat a\Local\Mi crosoft\Te amsMeeting Addin\1.0. 24151.1\x8 6\Microsof t.Teams.Ad dinLoader. dll" MD5: 878E47C8656E53AE8A8A21E927C6F7E0)
- cleanup
⊘No configs have been found
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security | ||
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security | ||
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security | ||
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security |
⊘No Sigma rule has matched
⊘No Snort rule has matched
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AV Detection |
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Source: | Code function: | 3_2_002F6982 |
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Source: | Code function: | 3_2_002F136F |
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Source: | Code function: | 3_2_002F136F |
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