buer | b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc

General

Target

b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe
Size

169KB
MD5

685f862334215b121715934b95732bdf
SHA1

dd83f5aea31e34b2d4a395741eef45749afc33b6
SHA256

b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc
SHA512

d56e2aa73d396ba551325dc9ebd29275696104f5a170bfbbdc320ec6c84c66f7efbc3b9178782f582e029c044948de24b6a850521fd866460efafaac4cd09b9e

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://gstatiknetiplist.cc/

https://gstatiknetiplist.com/

Signatures

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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\RedTools\\networker.exe\""	networker.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4344-131-0x0000000000030000-0x000000000003A000-memory.dmp	buer
behavioral2/memory/4344-132-0x0000000040000000-0x00000000429E0000-memory.dmp	buer
behavioral2/memory/1524-137-0x0000000040000000-0x00000000429E0000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1524	networker.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\B:	networker.exe
File opened (read-only)	\??\G:	networker.exe
File opened (read-only)	\??\I:	networker.exe
File opened (read-only)	\??\R:	networker.exe
File opened (read-only)	\??\S:	networker.exe
File opened (read-only)	\??\T:	networker.exe
File opened (read-only)	\??\W:	networker.exe
File opened (read-only)	\??\A:	networker.exe
File opened (read-only)	\??\Z:	networker.exe
File opened (read-only)	\??\M:	networker.exe
File opened (read-only)	\??\P:	networker.exe
File opened (read-only)	\??\V:	networker.exe
File opened (read-only)	\??\Y:	networker.exe
File opened (read-only)	\??\H:	networker.exe
File opened (read-only)	\??\N:	networker.exe
File opened (read-only)	\??\O:	networker.exe
File opened (read-only)	\??\Q:	networker.exe
File opened (read-only)	\??\X:	networker.exe
File opened (read-only)	\??\L:	networker.exe
File opened (read-only)	\??\F:	networker.exe
File opened (read-only)	\??\J:	networker.exe
File opened (read-only)	\??\K:	networker.exe
File opened (read-only)	\??\U:	networker.exe
File opened (read-only)	\??\E:	networker.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
848	4344	WerFault.exe	47
3348	1364	WerFault.exe	83

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1524	networker.exe
1524	networker.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4344 wrote to memory of 1524	4344	b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe	77
PID 4344 wrote to memory of 1524	4344	b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe	77
PID 4344 wrote to memory of 1524	4344	b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe	77
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83
PID 1524 wrote to memory of 1364	1524	networker.exe	83

C:\Users\Admin\AppData\Local\Temp\b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe
"C:\Users\Admin\AppData\Local\Temp\b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4344
- C:\ProgramData\RedTools\networker.exe
  C:\ProgramData\RedTools\networker.exe "C:\Users\Admin\AppData\Local\Temp\b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1524
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\RedTools\networker.exe
    3⤵
    PID:1364
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1364 -s 180
      4⤵
      Program crash
      PID:3348
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4344 -s 440
  2⤵
  - Program crash
  PID:848

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4344 -ip 4344
1⤵
PID:796

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 1364 -ip 1364
1⤵
PID:2276

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\RedTools\networker.exe

Filesize
169KB

MD5
685f862334215b121715934b95732bdf

SHA1
dd83f5aea31e34b2d4a395741eef45749afc33b6

SHA256
b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc

SHA512
d56e2aa73d396ba551325dc9ebd29275696104f5a170bfbbdc320ec6c84c66f7efbc3b9178782f582e029c044948de24b6a850521fd866460efafaac4cd09b9e

Download Submit
C:\ProgramData\RedTools\networker.exe

Filesize
169KB

MD5
685f862334215b121715934b95732bdf

SHA1
dd83f5aea31e34b2d4a395741eef45749afc33b6

SHA256
b6fb293632608978b34f2af759b51ff3ecd198eb495de43a0b845dceed513efc

SHA512
d56e2aa73d396ba551325dc9ebd29275696104f5a170bfbbdc320ec6c84c66f7efbc3b9178782f582e029c044948de24b6a850521fd866460efafaac4cd09b9e

Download Submit
memory/1364-139-0x0000000000EB0000-0x0000000003890000-memory.dmp

Filesize
41.9MB

Download
memory/1524-136-0x00000000005C3000-0x00000000005CA000-memory.dmp

Filesize
28KB

Download
memory/1524-137-0x0000000040000000-0x00000000429E0000-memory.dmp

Filesize
41.9MB

Download
memory/4344-130-0x0000000000472000-0x000000000047A000-memory.dmp

Filesize
32KB

Download
memory/4344-131-0x0000000000030000-0x000000000003A000-memory.dmp

Filesize
40KB

Download
memory/4344-132-0x0000000040000000-0x00000000429E0000-memory.dmp

Filesize
41.9MB

Download

Analysis

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