e92b44743b2c5d16b640d5480fd6395814b488671e429813251d18ea2e149073

General

Target

bd87756e621bd65c9a22700979ed276b.exe
Size

32KB
MD5

bd87756e621bd65c9a22700979ed276b
SHA1

1577b6a5f1c61bd5e7e6caf79e1d678508785f16
SHA256

e92b44743b2c5d16b640d5480fd6395814b488671e429813251d18ea2e149073
SHA512

27b36e0fa07169208395882d2754edf01566852a11bbde1197b09f54f5f659e2a71796cdfd65a5b1bb4ac34767f358f7f3f873f32e1e8ecceb0ad3e58182d22c
SSDEEP

768:cxvrR16lyByqFNHg0xpjzUCOwydxVRpsRjGBYPVz3j:eDR1Jyq3LjgTvpsRyBG3

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 2 IoCs

pid	Process
2892	wuaucldt.exe
3216	wuaucldt.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\wuaucldt = "c:\\windows\\system32\\wuaucldt.exe"	wuaucldt.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wuaucldt = "c:\\users\\admin\\wuaucldt.exe"	wuaucldt.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	svchost.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	\??\c:\windows\SysWOW64\wuaucldt.exe	bd87756e621bd65c9a22700979ed276b.exe
File created	\??\c:\windows\SysWOW64\wuaucldt.exe	wuaucldt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3216 set thread context of 4300	3216	wuaucldt.exe	92

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1008 wrote to memory of 2892	1008	bd87756e621bd65c9a22700979ed276b.exe	89
PID 1008 wrote to memory of 2892	1008	bd87756e621bd65c9a22700979ed276b.exe	89
PID 1008 wrote to memory of 2892	1008	bd87756e621bd65c9a22700979ed276b.exe	89
PID 2892 wrote to memory of 3216	2892	wuaucldt.exe	91
PID 2892 wrote to memory of 3216	2892	wuaucldt.exe	91
PID 2892 wrote to memory of 3216	2892	wuaucldt.exe	91
PID 3216 wrote to memory of 4300	3216	wuaucldt.exe	92
PID 3216 wrote to memory of 4300	3216	wuaucldt.exe	92
PID 3216 wrote to memory of 4300	3216	wuaucldt.exe	92
PID 3216 wrote to memory of 4300	3216	wuaucldt.exe	92
PID 3216 wrote to memory of 4300	3216	wuaucldt.exe	92
PID 1008 wrote to memory of 1568	1008	bd87756e621bd65c9a22700979ed276b.exe	94
PID 1008 wrote to memory of 1568	1008	bd87756e621bd65c9a22700979ed276b.exe	94
PID 1008 wrote to memory of 1568	1008	bd87756e621bd65c9a22700979ed276b.exe	94
PID 2892 wrote to memory of 2872	2892	wuaucldt.exe	96
PID 2892 wrote to memory of 2872	2892	wuaucldt.exe	96
PID 2892 wrote to memory of 2872	2892	wuaucldt.exe	96

C:\Users\Admin\AppData\Local\Temp\bd87756e621bd65c9a22700979ed276b.exe
"C:\Users\Admin\AppData\Local\Temp\bd87756e621bd65c9a22700979ed276b.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1008
- \??\c:\windows\SysWOW64\wuaucldt.exe
  c:\windows\system32\wuaucldt.exe
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:2892
- - \??\c:\users\admin\wuaucldt.exe
    c:\users\admin\wuaucldt.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3216
  - - C:\Windows\SysWOW64\svchost.exe
      C:\Windows\system32\svchost.exe
      4⤵
      Writes to the Master Boot Record (MBR)
      PID:4300
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c del c:\windows\syswow64\wuaucldt.exe
    3⤵
    PID:2872
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c del c:\users\admin\appdata\local\temp\BD8775~1.EXE
  2⤵
  PID:1568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\SysWOW64\wuaucldt.exe

Filesize
32KB

MD5
bd87756e621bd65c9a22700979ed276b

SHA1
1577b6a5f1c61bd5e7e6caf79e1d678508785f16

SHA256
e92b44743b2c5d16b640d5480fd6395814b488671e429813251d18ea2e149073

SHA512
27b36e0fa07169208395882d2754edf01566852a11bbde1197b09f54f5f659e2a71796cdfd65a5b1bb4ac34767f358f7f3f873f32e1e8ecceb0ad3e58182d22c

Download Submit
memory/1008-72-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1008-3-0x0000000070000000-0x000000007000B000-memory.dmp

Filesize
44KB

Download
memory/1008-2-0x0000000009000000-0x0000000009009000-memory.dmp

Filesize
36KB

Download
memory/1008-1-0x0000000009000000-0x0000000009009000-memory.dmp

Filesize
36KB

Download
memory/1008-73-0x0000000070000000-0x000000007000B000-memory.dmp

Filesize
44KB

Download
memory/1008-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2892-9-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2892-15-0x0000000070000000-0x000000007000B000-memory.dmp

Filesize
44KB

Download
memory/3216-19-0x0000000070000000-0x000000007000B000-memory.dmp

Filesize
44KB

Download
memory/3216-17-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4300-22-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-23-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-24-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-26-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-25-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-27-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download
memory/4300-21-0x00000000006E0000-0x00000000006E9000-memory.dmp

Filesize
36KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads