buer | 1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3

General

Target
1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe
Size 40KB
Sample220524-2211vsbad3
SHA256 1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3
MD5 b808bcbb1d9b94a4a71899964255ce0e
SHA1 c5e899db34a976f8396cdde8044ebb5ca67a513f
SHA512 6f1c8f6fd0ad1ded7a5ab3e39a45f0ca22bc12100117b3a58f613184069128e7e21b7685262f3647408c6871ea8a5e2a07e53379634f65a45b71552d69620ff9
MD5 SHA1 SHA512

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://koralak.hk/
eqqmp7,,hlo^i^h+eh,

Signatures

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

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/files/0x0009000000023138-132.dat	buer
behavioral2/files/0x0009000000023138-131.dat	buer
behavioral2/memory/3508-133-0x0000000000000000-mapping.dmp	buer
behavioral2/memory/3508-134-0x00000000007E0000-0x00000000007EC000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
2324	manager.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-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	manager.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\ActiveX Component = "C:\\Users\\Admin\\AppData\\Roaming\\ActiveX\\manager.exe"	manager.exe
Key created	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	secinit.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\ActiveX Component = "C:\\Users\\Admin\\AppData\\Roaming\\ActiveX\\manager.exe"	secinit.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3508	secinit.exe
3508	secinit.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 2636 wrote to memory of 2324	2636	1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe	28
PID 2636 wrote to memory of 2324	2636	1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe	28
PID 2636 wrote to memory of 2324	2636	1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe	28
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78
PID 2324 wrote to memory of 3508	2324	manager.exe	78

C:\Users\Admin\AppData\Local\Temp\1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe
"C:\Users\Admin\AppData\Local\Temp\1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2636
- C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
  C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe "C:\Users\Admin\AppData\Local\Temp\1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3.exe" ensgJJ
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:2324
- - C:\Windows\SysWOW64\secinit.exe
    C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
    3⤵
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    PID:3508

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

manager.exe

Path C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
Size 40KB
SHA256 1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3
MD5 b808bcbb1d9b94a4a71899964255ce0e
SHA1 c5e899db34a976f8396cdde8044ebb5ca67a513f
SHA512 6f1c8f6fd0ad1ded7a5ab3e39a45f0ca22bc12100117b3a58f613184069128e7e21b7685262f3647408c6871ea8a5e2a07e53379634f65a45b71552d69620ff9
SSDEEP 768:8GsFo1b76l7V/x7kt794oT0zNvYrCxyfFXEU7:8GsFo1b76HxYtyooyeGEU7
MD5 SHA1 SHA512 SSDEEP

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manager.exe

Path C:\Users\Admin\AppData\Roaming\ActiveX\manager.exe
Size 40KB
SHA256 1f8595d066ee69e7454b30b718102bbd04122ba8a5bab1e9d5f4532b7a7305a3
MD5 b808bcbb1d9b94a4a71899964255ce0e
SHA1 c5e899db34a976f8396cdde8044ebb5ca67a513f
SHA512 6f1c8f6fd0ad1ded7a5ab3e39a45f0ca22bc12100117b3a58f613184069128e7e21b7685262f3647408c6871ea8a5e2a07e53379634f65a45b71552d69620ff9
SSDEEP 768:8GsFo1b76l7V/x7kt794oT0zNvYrCxyfFXEU7:8GsFo1b76HxYtyooyeGEU7
MD5 SHA1 SHA512 SSDEEP

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memory/3508-134-0x00000000007E0000-0x00000000007EC000-memory.dmp

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Analysis

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