buer | b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e

General

Target

b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe
Size

31KB
MD5

d91559ae45b8f9bc903d27703211b119
SHA1

f1b02bf6d06cfba37bfea3a5fdc0664cd7b8b91a
SHA256

b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e
SHA512

3b048d58c7024a7d0ca78b0ffc2ec066bb4712082f8f33fd1aa853fc0ba37d207825be8517e57f548852c6bc2681a16196f7ddfd0dd792d2cb69a21afaa564af

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://java-stat.com/

https://installerr.pw/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Buer Loader 10 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/files/0x000a0000000122fb-55.dat	buer
behavioral1/files/0x000a0000000122fb-56.dat	buer
behavioral1/files/0x000a0000000122fb-58.dat	buer
behavioral1/files/0x000a0000000122fb-60.dat	buer
behavioral1/memory/1644-64-0x00000000000C0000-0x00000000000CB000-memory.dmp	buer
behavioral1/memory/1644-65-0x00000000000C0000-0x00000000000CB000-memory.dmp	buer
behavioral1/memory/1644-66-0x00000000000C0000-0x00000000000CB000-memory.dmp	buer
behavioral1/memory/1644-69-0x0000000000000000-mapping.dmp	buer
behavioral1/memory/1644-71-0x00000000000C0000-0x00000000000CB000-memory.dmp	buer
behavioral1/memory/1644-72-0x00000000000C0000-0x00000000000CB000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
900	manager.exe

Deletes itself 1 IoCs

pid	Process
900	manager.exe

Loads dropped DLL 2 IoCs

pid	Process
1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe
1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	manager.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ActiveX Component = "C:\\Users\\Admin\\AppData\\Roaming\\ActiveX\\manager.exe"	manager.exe
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	secinit.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\ActiveX Component = "C:\\Users\\Admin\\AppData\\Roaming\\ActiveX\\manager.exe"	secinit.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1644	secinit.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1992 wrote to memory of 900	1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe	28
PID 1992 wrote to memory of 900	1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe	28
PID 1992 wrote to memory of 900	1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe	28
PID 1992 wrote to memory of 900	1992	b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe	28
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29
PID 900 wrote to memory of 1644	900	manager.exe	29

C:\Users\Admin\AppData\Local\Temp\b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe
"C:\Users\Admin\AppData\Local\Temp\b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1992
- C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
  C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe "C:\Users\Admin\AppData\Local\Temp\b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e.exe" ensgJJ
  2⤵
  - Executes dropped EXE
  - Deletes itself
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:900
- - C:\Windows\SysWOW64\secinit.exe
    C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
    3⤵
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    PID:1644

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

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:\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
31KB

MD5
d91559ae45b8f9bc903d27703211b119

SHA1
f1b02bf6d06cfba37bfea3a5fdc0664cd7b8b91a

SHA256
b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e

SHA512
3b048d58c7024a7d0ca78b0ffc2ec066bb4712082f8f33fd1aa853fc0ba37d207825be8517e57f548852c6bc2681a16196f7ddfd0dd792d2cb69a21afaa564af

Download Submit
C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
31KB

MD5
d91559ae45b8f9bc903d27703211b119

SHA1
f1b02bf6d06cfba37bfea3a5fdc0664cd7b8b91a

SHA256
b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e

SHA512
3b048d58c7024a7d0ca78b0ffc2ec066bb4712082f8f33fd1aa853fc0ba37d207825be8517e57f548852c6bc2681a16196f7ddfd0dd792d2cb69a21afaa564af

Download Submit
\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
31KB

MD5
d91559ae45b8f9bc903d27703211b119

SHA1
f1b02bf6d06cfba37bfea3a5fdc0664cd7b8b91a

SHA256
b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e

SHA512
3b048d58c7024a7d0ca78b0ffc2ec066bb4712082f8f33fd1aa853fc0ba37d207825be8517e57f548852c6bc2681a16196f7ddfd0dd792d2cb69a21afaa564af

Download Submit
\Users\Admin\AppData\Roaming\ActiveX\manager.exe

Filesize
31KB

MD5
d91559ae45b8f9bc903d27703211b119

SHA1
f1b02bf6d06cfba37bfea3a5fdc0664cd7b8b91a

SHA256
b73e52768067d97464a6991027693246fad1afb144cbf9c9e66ffc840cc8542e

SHA512
3b048d58c7024a7d0ca78b0ffc2ec066bb4712082f8f33fd1aa853fc0ba37d207825be8517e57f548852c6bc2681a16196f7ddfd0dd792d2cb69a21afaa564af

Download Submit
memory/1644-61-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-62-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-64-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-65-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-66-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-67-0x00000000000D0000-0x00000000000D1000-memory.dmp

Filesize
4KB

Download
memory/1644-71-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1644-72-0x00000000000C0000-0x00000000000CB000-memory.dmp

Filesize
44KB

Download
memory/1992-54-0x00000000751C1000-0x00000000751C3000-memory.dmp

Filesize
8KB

Download

Analysis

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