b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00

General

Target

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Size

74KB
MD5

74d7170d8b910ae2e2453337fdee45b5
SHA1

42bd70ccffd224630d2b04b82a7df33053a8613a
SHA256

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00
SHA512

9c9494a2f08954909a89c58be0c96d57c35b3dc4e2831d8ae6028da526c015000aff3363e102eae4122faa55fa84ce5aab7a726f64678f9123ff63af142bbefc
SSDEEP

768:agO5xRYi+SfSWHHNvvG5bnl/NqNwsKVDstHxYD0p1aXKynF0vQmYZS0HdJnfWO:RshfSWHHNvoLqNwDDGw02eQmh0HjWO

Score

7^/10

persistence

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

rundll32.exe

pid process

2168 rundll32.exe

pid	process
2168	rundll32.exe

Loads dropped DLL 2 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

pid	process
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

Modifies system executable filetype association 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exerundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe

Drops file in System32 directory 4 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

description	ioc	process
File created	C:\Windows\SysWOW64\notepad¢¬.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
File opened for modification	C:\Windows\SysWOW64\¢«.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
File created	C:\Windows\SysWOW64\¢«.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
File opened for modification	C:\Windows\SysWOW64\notepad¢¬.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

Drops file in Windows directory 2 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

description	ioc	process
File opened for modification	C:\Windows\system\rundll32.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
File created	C:\Windows\system\rundll32.exe	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

Modifies registry class 15 IoCs

Processes:

rundll32.exeb1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainUp = "1716519960"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad.exe %1"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainSetup = "1716519960"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	rundll32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainVer = "506"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	rundll32.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

pid	process
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

rundll32.exe

pid process

2168 rundll32.exe
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exerundll32.exe

pid process

3008 b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
2168 rundll32.exe
2168 rundll32.exe

pid	process
2168	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe

description	pid	process	target process
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe
PID 3008 wrote to memory of 2168	3008	b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe
"C:\Users\Admin\AppData\Local\Temp\b1f2fcaff038e4ad2b718d3b4c07f7744c103490fb6b2f849f40b7024db38c00.exe"
1⤵
- Loads dropped DLL
- Modifies system executable filetype association
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3008

C:\Windows\system\rundll32.exe
C:\Windows\system\rundll32.exe
2⤵
- Executes dropped EXE
- Modifies system executable filetype association
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:2168

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Privilege Escalation

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\notepad¢¬.exe

Filesize
82KB

MD5
bfdc10ad3a55829f6e0b158ef088998e

SHA1
a33e538f14c494c36e8510ba4a152a7b2f9a40ba

SHA256
1520949d06add8be40ed56b571d30d5d9191ec0349c758bf3a89a61a22769607

SHA512
319986be597441d630c3a2b254cda8f3b060e4b08f1bb4e110efc6f908bba042db0f643fcf3369175507f6854382224375d0c63c588105b3cbcd3d02e4bcb827

Download Submit
\Windows\system\rundll32.exe

Filesize
83KB

MD5
4697495e517c3865e68960cf3861216e

SHA1
f6b81cd8fbff5d7fe1b7f8e7a559e62a014dce5c

SHA256
756acc4e8c31bd848b7dab3b318b3934fe10e390d9515da94477550eb77e5f95

SHA512
8db714bd717adba6a1cd45179235fd6096554895dfb453439df3dcc00f69363ff8650cb148738738fceea8d503acb11ef17ac070aaaf057658db8bcac9447819

Download Submit
memory/2168-19-0x0000000000400000-0x0000000000415A00-memory.dmp

Filesize
86KB

Download
memory/3008-0-0x0000000000400000-0x0000000000415A00-memory.dmp

Filesize
86KB

Download
memory/3008-12-0x00000000002E0000-0x00000000002F6000-memory.dmp

Filesize
88KB

Download
memory/3008-18-0x00000000002E0000-0x00000000002F6000-memory.dmp

Filesize
88KB

Download
memory/3008-21-0x0000000000400000-0x0000000000415A00-memory.dmp

Filesize
86KB

Download
memory/3008-22-0x00000000002E0000-0x00000000002E2000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads