webmonitor | 0840ee0bd9c63124f8277cddea37e7a01a55b08cb63c399e3f27f8ab1fa3835e

Resubmissions

13-08-2021 14:12

210813-q76n7r455s 10

13-08-2021 14:05

210813-mpgh2evkzs 10

Analysis

max time kernel
303s
max time network
309s
platform
windows10_x64
resource
win10v20210408
submitted
13-08-2021 14:12

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General

Target

Loader-IDB.exe
Size

2.0MB
MD5

fe4f22e8d5f3a4b2bcd81bd69429c12b
SHA1

50eec07da09636ab7108e93a2a17224724d5f8c2
SHA256

e0fb9bf9bd903a2ea4bc952b168482bd15af73dd1b4ae47529aa10fe6a9112a0
SHA512

6295463804ae0b84e90a6dc04d4a673fce7eea5c8f3a9017aae52eb4ea6c0a522e94fe8f9b5403cd42449a78aac438d0d53e44457581d67c4cd94886054b0ef2

Score

10^/10

webmonitor backdoor infostealer persistence rat suricata 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-1-5-21-1594587808-2047097707-2163810515-1000\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/412-141-0x00000000005F5A70-mapping.dmp	family_webmonitor

suricata: ET MALWARE WebMonitor/RevCode RAT CnC Domain in DNS Lookup
suricata: ET MALWARE WebMonitor/RevCode RAT CnC Domain in DNS Lookup
suricata

Executes dropped EXE 9 IoCs

pid	Process
1308	Anyname.exe
2700	Patch.exe
412	MSBuild.exe
4064	MSBuild.exe
3720	revpe.exe
3452	MSBuild.exe
368	revpe.exe
3908	MSBuild.exe
2876	MSBuild.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000100000001ab2b-118.dat	upx
behavioral1/files/0x000100000001ab2b-119.dat	upx
behavioral1/memory/412-140-0x0000000000400000-0x00000000005F7000-memory.dmp	upx
behavioral1/memory/412-143-0x0000000000400000-0x00000000005F7000-memory.dmp	upx
behavioral1/memory/3720-146-0x0000000000400000-0x000000000041B000-memory.dmp	upx
behavioral1/memory/3720-160-0x0000000000400000-0x000000000041B000-memory.dmp	upx

Loads dropped DLL 1 IoCs

pid	Process
2700	Patch.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe\uf800"	MSBuild.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe\uf800"	MSBuild.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe"	MSBuild.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe"	MSBuild.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe\ue700"	MSBuild.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\WM-f6ff = "C:\\Users\\Admin\\AppData\\Roaming\\WM-f6ff.exe\ue700"	MSBuild.exe

Suspicious use of SetThreadContext 6 IoCs

description	pid	Process	procid_target
PID 1420 set thread context of 1348	1420	Loader-IDB.exe	79
PID 1348 set thread context of 412	1348	regasm.exe	83
PID 412 set thread context of 3720	412	MSBuild.exe	86
PID 412 set thread context of 368	412	MSBuild.exe	93
PID 412 set thread context of 3908	412	MSBuild.exe	89
PID 412 set thread context of 2876	412	MSBuild.exe	91

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
1348	regasm.exe
1348	regasm.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1420	Loader-IDB.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1348	regasm.exe
Token: SeShutdownPrivilege	412	MSBuild.exe
Token: SeCreatePagefilePrivilege	412	MSBuild.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1420	Loader-IDB.exe
412	MSBuild.exe

Suspicious use of WriteProcessMemory 55 IoCs

description	pid	Process	procid_target
PID 1420 wrote to memory of 1308	1420	Loader-IDB.exe	77
PID 1420 wrote to memory of 1308	1420	Loader-IDB.exe	77
PID 1420 wrote to memory of 1308	1420	Loader-IDB.exe	77
PID 1308 wrote to memory of 2700	1308	Anyname.exe	78
PID 1308 wrote to memory of 2700	1308	Anyname.exe	78
PID 1308 wrote to memory of 2700	1308	Anyname.exe	78
PID 1420 wrote to memory of 1348	1420	Loader-IDB.exe	79
PID 1420 wrote to memory of 1348	1420	Loader-IDB.exe	79
PID 1420 wrote to memory of 1348	1420	Loader-IDB.exe	79
PID 1420 wrote to memory of 1348	1420	Loader-IDB.exe	79
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 1348 wrote to memory of 412	1348	regasm.exe	83
PID 412 wrote to memory of 4064	412	MSBuild.exe	85
PID 412 wrote to memory of 4064	412	MSBuild.exe	85
PID 412 wrote to memory of 4064	412	MSBuild.exe	85
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3720	412	MSBuild.exe	86
PID 412 wrote to memory of 3452	412	MSBuild.exe	87
PID 412 wrote to memory of 3452	412	MSBuild.exe	87
PID 412 wrote to memory of 3452	412	MSBuild.exe	87
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 368	412	MSBuild.exe	93
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 3908	412	MSBuild.exe	89
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91
PID 412 wrote to memory of 2876	412	MSBuild.exe	91

C:\Users\Admin\AppData\Local\Temp\Loader-IDB.exe
"C:\Users\Admin\AppData\Local\Temp\Loader-IDB.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1420
- C:\ProgramData\Anyname.exe
  "C:\ProgramData\Anyname.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:1308
- - C:\Users\Admin\AppData\Local\Temp\Patch.exe
    Patch.exe /silent
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:2700
- 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
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1348
- - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
    C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of SetThreadContext
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:412
  - - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
      -d 56007 TCP
      4⤵
      Executes dropped EXE
      PID:4064
  - - C:\Users\Admin\AppData\Local\Temp\revpe.exe
      -d 56007 TCP
      4⤵
      Executes dropped EXE
      PID:3720
  - - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
      -a 10.10.0.27 56007 56007 TCP
      4⤵
      Executes dropped EXE
      PID:3452
  - - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
      -d 56008 TCP
      4⤵
      Executes dropped EXE
      PID:3908
  - - C:\Users\Admin\AppData\Local\Temp\MSBuild.exe
      -a 10.10.0.27 56008 56008 TCP
      4⤵
      Executes dropped EXE
      PID:2876
  - - C:\Users\Admin\AppData\Local\Temp\revpe.exe
      -a 10.10.0.27 56007 56007 TCP
      4⤵
      Executes dropped EXE
      PID:368

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1092

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

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/412-140-0x0000000000400000-0x00000000005F7000-memory.dmp

Filesize
2.0MB

Download
memory/412-144-0x00000000033F0000-0x00000000043F0000-memory.dmp

Filesize
16.0MB

Download
memory/412-143-0x0000000000400000-0x00000000005F7000-memory.dmp

Filesize
2.0MB

Download
memory/1348-133-0x00000000054D0000-0x00000000054D1000-memory.dmp

Filesize
4KB

Download
memory/1348-139-0x0000000007B30000-0x0000000007BAC000-memory.dmp

Filesize
496KB

Download
memory/1348-131-0x0000000005500000-0x0000000005501000-memory.dmp

Filesize
4KB

Download
memory/1348-134-0x0000000007530000-0x0000000007622000-memory.dmp

Filesize
968KB

Download
memory/1348-132-0x0000000005460000-0x000000000595E000-memory.dmp

Filesize
5.0MB

Download
memory/1348-130-0x0000000005960000-0x0000000005961000-memory.dmp

Filesize
4KB

Download
memory/1348-126-0x0000000000400000-0x000000000057B000-memory.dmp

Filesize
1.5MB

Download
memory/1348-127-0x0000000000FF0000-0x000000000113A000-memory.dmp

Filesize
1.3MB

Download
memory/1420-116-0x00000000008E0000-0x00000000008E1000-memory.dmp

Filesize
4KB

Download
memory/1420-124-0x0000000003A30000-0x0000000003A38000-memory.dmp

Filesize
32KB

Download
memory/3720-146-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/3720-160-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download