d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd

Analysis

max time kernel
170s
max time network
180s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
07-11-2022 08:31

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General

Target

d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
Size

638KB
MD5

0e2c559240034863fb3febbcf6d76312
SHA1

45da16198a050f0435088c08850f7adef195b8b0
SHA256

d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd
SHA512

b0067f211788664d224d3664fa8c9061022cadfdc2b6990da1e292741b8387be47cdf63bc54993c3e4585f2992a844f340309e6d7b452fb8de8d152fbeb71b13
SSDEEP

6144:9vZ2iKiZ/QAKVfiROzkViZwc0W/1vNuMqTp/CelAaWjSZ/nWnKCXreO:d7wVfiRuqPW/dgMqIHdjSFWnKCX

Score

10^/10

evasion persistence 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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe RVHOST.exe"	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe

Disables RegEdit via registry modification 1 IoCs

evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe

Disables Task Manager via registry modification
evasion

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3088-132-0x0000000000400000-0x00000000004A3000-memory.dmp	upx
behavioral2/memory/3088-133-0x0000000000400000-0x00000000004A3000-memory.dmp	upx

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Yahoo Messengger = "C:\\Windows\\system32\\RVHOST.exe"	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\RVHOST.exe	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
File opened for modification	C:\Windows\SysWOW64\RVHOST.exe	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
File created	C:\Windows\SysWOW64\setting.ini	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\RVHOST.exe	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
File opened for modification	C:\Windows\RVHOST.exe	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3088 wrote to memory of 1248	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	80
PID 3088 wrote to memory of 1248	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	80
PID 3088 wrote to memory of 1248	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	80
PID 1248 wrote to memory of 3208	1248	cmd.exe	82
PID 1248 wrote to memory of 3208	1248	cmd.exe	82
PID 1248 wrote to memory of 3208	1248	cmd.exe	82
PID 3088 wrote to memory of 952	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	83
PID 3088 wrote to memory of 952	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	83
PID 3088 wrote to memory of 952	3088	d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe	83
PID 952 wrote to memory of 4568	952	cmd.exe	85
PID 952 wrote to memory of 4568	952	cmd.exe	85
PID 952 wrote to memory of 4568	952	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe
"C:\Users\Admin\AppData\Local\Temp\d57980cf661ee669e71eb50a0f06019e8f519d212fc71907f37bbe1d9b4eddfd.exe"
1⤵
- Modifies WinLogon for persistence
- Disables RegEdit via registry modification
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:3088
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /C AT /delete /yes
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1248
- - C:\Windows\SysWOW64\at.exe
    AT /delete /yes
    3⤵
    PID:3208
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su C:\Windows\system32\RVHOST.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:952
- - C:\Windows\SysWOW64\at.exe
    AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su C:\Windows\system32\RVHOST.exe
    3⤵
    PID:4568

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

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Downloads

memory/3088-132-0x0000000000400000-0x00000000004A3000-memory.dmp

Filesize
652KB

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memory/3088-133-0x0000000000400000-0x00000000004A3000-memory.dmp

Filesize
652KB

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Analysis

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General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads