50bc943a1cfbf28c600addf7fb64b002df0d86a2a58fbf2159d8cb7ec6498582

Analysis

max time kernel
93s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-en-20220112
submitted
26/02/2022, 18:38

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General

Target
MonsterEC.exe
Size 3.1MB
Sample220226-w92pgacgbr
SHA256 50bc943a1cfbf28c600addf7fb64b002df0d86a2a58fbf2159d8cb7ec6498582
MD5 ad21d0673c6937e4960e24884d4790f9
SHA1 7d70796e732075dca65022977638005e809a5105
SHA512 66f8d75ee0f1757008253936a20f20932b51af40c012d729ca753a128b2d2f2b2091836aae15c12a9034971e545fdd00a1b8d6309cce9b283a08330fea8993a6
MD5 SHA1 SHA512

Score

9^/10

spyware stealer upx

Malware Config

Signatures

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/files/0x000300000001e7ae-155.dat	WebBrowserPassView
behavioral2/files/0x000300000001e7ae-156.dat	WebBrowserPassView

Nirsoft 8 IoCs

resource	yara_rule
behavioral2/files/0x000400000001ed34-150.dat	Nirsoft
behavioral2/files/0x000400000001ed34-151.dat	Nirsoft
behavioral2/files/0x000300000001e7ae-155.dat	Nirsoft
behavioral2/files/0x000300000001e7ae-156.dat	Nirsoft
behavioral2/files/0x00070000000220e7-163.dat	Nirsoft
behavioral2/files/0x00070000000220e7-165.dat	Nirsoft
behavioral2/files/0x00070000000220e9-170.dat	Nirsoft
behavioral2/files/0x00070000000220e9-171.dat	Nirsoft

Executes dropped EXE 7 IoCs

pid	Process
3456	RtkBtManServ.exe
3444	bfsvc.exe
1852	snuvcdsm.exe
3048	winhlp32.exe
1576	splwow64.exe
3468	hh.exe
1216	xwizard.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x00070000000220e6-160.dat	upx
behavioral2/files/0x00070000000220e6-161.dat	upx
behavioral2/files/0x00070000000220e8-164.dat	upx
behavioral2/files/0x00070000000220e8-162.dat	upx

Checks computer location settings 2 TTPs 6 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	RtkBtManServ.exe
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	MonsterEC.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\Registry\Machine\HARDWARE\DESCRIPTION\System\CentralProcessor\0	MusNotifyIcon.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	MusNotifyIcon.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000_Classes\Local Settings	RtkBtManServ.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
1852	snuvcdsm.exe
1852	snuvcdsm.exe
1852	snuvcdsm.exe
1852	snuvcdsm.exe
3468	hh.exe
3468	hh.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe
1216	xwizard.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3456	RtkBtManServ.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 1120 wrote to memory of 3456	1120	MonsterEC.exe	64
PID 1120 wrote to memory of 3456	1120	MonsterEC.exe	64
PID 3456 wrote to memory of 4048	3456	RtkBtManServ.exe	71
PID 3456 wrote to memory of 4048	3456	RtkBtManServ.exe	71
PID 4048 wrote to memory of 312	4048	WScript.exe	73
PID 4048 wrote to memory of 312	4048	WScript.exe	73
PID 312 wrote to memory of 3444	312	cmd.exe	75
PID 312 wrote to memory of 3444	312	cmd.exe	75
PID 312 wrote to memory of 3444	312	cmd.exe	75
PID 3456 wrote to memory of 2092	3456	RtkBtManServ.exe	76
PID 3456 wrote to memory of 2092	3456	RtkBtManServ.exe	76
PID 2092 wrote to memory of 2636	2092	WScript.exe	77
PID 2092 wrote to memory of 2636	2092	WScript.exe	77
PID 2636 wrote to memory of 1852	2636	cmd.exe	79
PID 2636 wrote to memory of 1852	2636	cmd.exe	79
PID 2636 wrote to memory of 1852	2636	cmd.exe	79
PID 3456 wrote to memory of 2404	3456	RtkBtManServ.exe	80
PID 3456 wrote to memory of 2404	3456	RtkBtManServ.exe	80
PID 2404 wrote to memory of 2976	2404	WScript.exe	81
PID 2404 wrote to memory of 2976	2404	WScript.exe	81
PID 2976 wrote to memory of 3048	2976	cmd.exe	83
PID 2976 wrote to memory of 3048	2976	cmd.exe	83
PID 2976 wrote to memory of 3048	2976	cmd.exe	83
PID 2976 wrote to memory of 1576	2976	cmd.exe	85
PID 2976 wrote to memory of 1576	2976	cmd.exe	85
PID 2976 wrote to memory of 1576	2976	cmd.exe	85
PID 2976 wrote to memory of 3468	2976	cmd.exe	84
PID 2976 wrote to memory of 3468	2976	cmd.exe	84
PID 2976 wrote to memory of 3468	2976	cmd.exe	84
PID 3456 wrote to memory of 2644	3456	RtkBtManServ.exe	86
PID 3456 wrote to memory of 2644	3456	RtkBtManServ.exe	86
PID 2644 wrote to memory of 312	2644	WScript.exe	87
PID 2644 wrote to memory of 312	2644	WScript.exe	87
PID 312 wrote to memory of 1216	312	cmd.exe	89
PID 312 wrote to memory of 1216	312	cmd.exe	89
PID 312 wrote to memory of 1216	312	cmd.exe	89
PID 3456 wrote to memory of 2408	3456	RtkBtManServ.exe	90
PID 3456 wrote to memory of 2408	3456	RtkBtManServ.exe	90
PID 2408 wrote to memory of 2128	2408	cmd.exe	92
PID 2408 wrote to memory of 2128	2408	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\MonsterEC.exe
"C:\Users\Admin\AppData\Local\Temp\MonsterEC.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1120
- C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe
  "C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe" ZhXl39BlhP84+Y4kurA8wpehxxqA0X22IMYZ6Vpiqs4X7jyxwVp7B9UIzzW1XyBMtgRpPMrEOhA6uzcGHjU2MLrRUFVDs/WQRC5/+cWLJYj56iRlUUNEvBTHUa57eGJf+Jx/g5S/N21JpySOR0auWoVBj/cTYy5DVXIgPIgDmfo=
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3456
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:4048
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c compile.bat
      4⤵
      Suspicious use of WriteProcessMemory
      PID:312
    - - C:\Users\Admin\AppData\Local\Temp\bfsvc.exe
        
        C:\Users\Admin\AppData\Local\Temp\bfsvc.exe /capture /Filename "C:\Users\Admin\AppData\Local\Temp\capture.png"
        5⤵
        Executes dropped EXE
        
        PID:3444
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:2092
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c compile.bat
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2636
    - - C:\Users\Admin\AppData\Local\Temp\snuvcdsm.exe
        
        C:\Users\Admin\AppData\Local\Temp\snuvcdsm.exe /stext "C:\Users\Admin\AppData\Local\Temp\Admin_Passwords.txt"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:1852
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:2404
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c compile.bat
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2976
    - - C:\Users\Admin\AppData\Local\Temp\winhlp32.exe
        
        C:\Users\Admin\AppData\Local\Temp\winhlp32.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies1"
        5⤵
        Executes dropped EXE
        
        PID:3048
    - - C:\Users\Admin\AppData\Local\Temp\hh.exe
        
        C:\Users\Admin\AppData\Local\Temp\hh.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies3"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:3468
    - - C:\Users\Admin\AppData\Local\Temp\splwow64.exe
        
        C:\Users\Admin\AppData\Local\Temp\splwow64.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies2"
        5⤵
        Executes dropped EXE
        
        PID:1576
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
    3⤵
    - Checks computer location settings
    - Suspicious use of WriteProcessMemory
    PID:2644
  - - C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c compile.bat
      4⤵
      Suspicious use of WriteProcessMemory
      PID:312
    - - C:\Users\Admin\AppData\Local\Temp\xwizard.exe
        
        C:\Users\Admin\AppData\Local\Temp\xwizard.exe /stext "C:\Users\Admin\AppData\Local\Temp\Admin_History.txt"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        
        PID:1216
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C choice /C Y /N /D Y /T 3 & Del "C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2408
  - - C:\Windows\system32\choice.exe
      choice /C Y /N /D Y /T 3
      4⤵
      PID:2128

C:\Windows\system32\MusNotifyIcon.exe
%systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 0
1⤵
- Checks processor information in registry
PID:448

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1120-132-0x0000000005670000-0x0000000005C14000-memory.dmp

Download

memory/1120-134-0x0000000004FB0000-0x0000000004FB1000-memory.dmp

Download

memory/1120-131-0x00000000002B0000-0x00000000005D0000-memory.dmp

Download

memory/1120-130-0x0000000074D9E000-0x0000000074D9F000-memory.dmp

Download

memory/1120-138-0x00000000062D0000-0x0000000006362000-memory.dmp

Download

memory/1120-133-0x00000000052B0000-0x0000000005316000-memory.dmp

Download

memory/1120-135-0x00000000002C2000-0x00000000002C3000-memory.dmp

Download

memory/3456-144-0x000001A6DD900000-0x000001A6DD922000-memory.dmp

Download

memory/3456-145-0x000001A6DD930000-0x000001A6DD94A000-memory.dmp

Download

memory/3456-141-0x000001A6DD970000-0x000001A6DD972000-memory.dmp

Download

memory/3456-142-0x000001A6DD7A0000-0x000001A6DD816000-memory.dmp

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memory/3456-139-0x000001A6C1A80000-0x000001A6C1D5A000-memory.dmp

Download

memory/3456-140-0x00007FFDF47D3000-0x00007FFDF47D5000-memory.dmp

Download

memory/3456-147-0x000001A6DE200000-0x000001A6DE21E000-memory.dmp

Download

memory/3456-146-0x000001A6DDF00000-0x000001A6DDF08000-memory.dmp

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