b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2

Analysis

max time kernel
39s
max time network
46s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
06-12-2022 21:27

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General

Target

b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2.dll
Size

26KB
MD5

fb8404128eb95187e46854b366b4cef7
SHA1

9bdd8edd6d6ca2f240ba0aeff50edd72e193811b
SHA256

b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2
SHA512

65cd1ec3bcf1586a3bc85b65df537a6501e58235da75abb736688836e2ef3e4867420e94cee86ce88043b8b013f639b48a01b600b52899cb741d7bc5aa335d69
SSDEEP

384:cCyzkscPVcdw5wpcRFQ5LLcE17W4lbKwEtezeDLGFI7pMbGMLwBfK+D5NWUDSnwB:cCGXewOQ5LL3o4lbznFaAgxpNpRB

Score

8^/10

persistence upx

Malware Config

Signatures

UPX packed file 1 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1692-58-0x0000000010000000-0x0000000010107000-memory.dmp	upx

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\ins = "b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2.dll,"	rundll32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\SfcDisable = "4294967197"	rundll32.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2036	1692	WerFault.exe	27

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1900 wrote to memory of 1692	1900	rundll32.exe	27
PID 1692 wrote to memory of 1924	1692	rundll32.exe	28
PID 1692 wrote to memory of 1924	1692	rundll32.exe	28
PID 1692 wrote to memory of 1924	1692	rundll32.exe	28
PID 1692 wrote to memory of 1924	1692	rundll32.exe	28
PID 1692 wrote to memory of 2036	1692	rundll32.exe	30
PID 1692 wrote to memory of 2036	1692	rundll32.exe	30
PID 1692 wrote to memory of 2036	1692	rundll32.exe	30
PID 1692 wrote to memory of 2036	1692	rundll32.exe	30

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1900
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b2797a6c55267e3ca1743767c8ee95a13f262f013cb90ea9ffc0869358ce88b2.dll,#1
  2⤵
  - Modifies WinLogon
  - Suspicious use of WriteProcessMemory
  PID:1692
- - C:\Windows\SysWOW64\sfc.exe
    "C:\Windows\system32\sfc.exe" /REVERT
    3⤵
    PID:1924
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 360
    3⤵
    - Program crash
    PID:2036

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/1692-54-0x0000000000000000-mapping.dmp

Download
memory/1692-55-0x0000000075A81000-0x0000000075A83000-memory.dmp

Filesize
8KB

Download
memory/1692-58-0x0000000010000000-0x0000000010107000-memory.dmp

Filesize
1.0MB

Download
memory/1924-56-0x0000000000000000-mapping.dmp

Download
memory/2036-57-0x0000000000000000-mapping.dmp

Download