webmonitor | e0fb9bf9bd903a2ea4bc952b168482bd15af73dd1b4ae47529aa10fe6a9112a0

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7v20210410
submitted
31-07-2021 08:15

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General

Target

fe4f22e8d5f3a4b2bcd81bd69429c12b.exe
Size

2.0MB
MD5

fe4f22e8d5f3a4b2bcd81bd69429c12b
SHA1

50eec07da09636ab7108e93a2a17224724d5f8c2
SHA256

e0fb9bf9bd903a2ea4bc952b168482bd15af73dd1b4ae47529aa10fe6a9112a0
SHA512

6295463804ae0b84e90a6dc04d4a673fce7eea5c8f3a9017aae52eb4ea6c0a522e94fe8f9b5403cd42449a78aac438d0d53e44457581d67c4cd94886054b0ef2

Score

10^/10

webmonitor backdoor infostealer persistence rat upx

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\stream.exe\","	regasm.exe

RevcodeRat, WebMonitorRat
WebMonitor is a remote access tool that you can use from any browser access to control, and monitor your phones, or PCs.
backdoor rat infostealer webmonitor

WebMonitor Payload 1 IoCs

resource	yara_rule
behavioral1/memory/896-88-0x00000000005F5A70-mapping.dmp	family_webmonitor

Executes dropped EXE 3 IoCs

pid	Process
1984	Anyname.exe
1900	Patch.exe
896	MSBuild.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x00040000000130e0-62.dat	upx
behavioral1/files/0x00040000000130e0-63.dat	upx
behavioral1/files/0x00040000000130e0-65.dat	upx
behavioral1/memory/896-87-0x0000000000400000-0x00000000005F7000-memory.dmp	upx
behavioral1/memory/896-90-0x0000000000400000-0x00000000005F7000-memory.dmp	upx

Loads dropped DLL 5 IoCs

pid	Process
1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe
1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe
1984	Anyname.exe
1900	Patch.exe
1612	regasm.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1044 set thread context of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1612 set thread context of 896	1612	regasm.exe	32

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1612	regasm.exe
1612	regasm.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1612	regasm.exe
Token: SeDebugPrivilege	896	MSBuild.exe
Token: SeShutdownPrivilege	896	MSBuild.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1044 wrote to memory of 1984	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	26
PID 1044 wrote to memory of 1984	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	26
PID 1044 wrote to memory of 1984	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	26
PID 1044 wrote to memory of 1984	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	26
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1984 wrote to memory of 1900	1984	Anyname.exe	27
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1044 wrote to memory of 1612	1044	fe4f22e8d5f3a4b2bcd81bd69429c12b.exe	31
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32
PID 1612 wrote to memory of 896	1612	regasm.exe	32

C:\Users\Admin\AppData\Local\Temp\fe4f22e8d5f3a4b2bcd81bd69429c12b.exe
"C:\Users\Admin\AppData\Local\Temp\fe4f22e8d5f3a4b2bcd81bd69429c12b.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1044
- C:\ProgramData\Anyname.exe
  "C:\ProgramData\Anyname.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1984
- - C:\Users\Admin\AppData\Local\Temp\Patch.exe
    Patch.exe /silent
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:1900
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1612
- - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
    C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:896

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/896-92-0x0000000002F70000-0x0000000003F70000-memory.dmp

Filesize
16.0MB

Download
memory/896-90-0x0000000000400000-0x00000000005F7000-memory.dmp

Filesize
2.0MB

Download
memory/896-87-0x0000000000400000-0x00000000005F7000-memory.dmp

Filesize
2.0MB

Download
memory/1044-72-0x00000000025D0000-0x00000000025D8000-memory.dmp

Filesize
32KB

Download
memory/1044-61-0x0000000075721000-0x0000000075723000-memory.dmp

Filesize
8KB

Download
memory/1044-71-0x00000000002C0000-0x00000000002C1000-memory.dmp

Filesize
4KB

Download
memory/1612-79-0x0000000005010000-0x0000000005011000-memory.dmp

Filesize
4KB

Download
memory/1612-78-0x0000000000110000-0x0000000000122000-memory.dmp

Filesize
72KB

Download
memory/1612-80-0x0000000005E80000-0x0000000005F72000-memory.dmp

Filesize
968KB

Download
memory/1612-85-0x0000000005420000-0x000000000549C000-memory.dmp

Filesize
496KB

Download
memory/1612-77-0x0000000000400000-0x000000000057B000-memory.dmp

Filesize
1.5MB

Download