buer | 4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

General

Target

ReviewPrint.exe
Size

330KB
MD5

5be0349cfd478100b67fa4a867cfc516
SHA1

ad95587989a7bdeb80380a9e8b179f7e11db53a8
SHA256

4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066
SHA512

4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534
SSDEEP

1536:OphmidUnwrFnOATLZ+ZlDD44444444444444444444444444444444444444444t:sJUGpU1T83KvqAwsiYQmwf

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://161.35.192.121/

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

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ee1f742b7ab60297abc5\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral1/memory/2388-0-0x0000000000340000-0x000000000034F000-memory.dmp	buer
behavioral1/memory/2388-3-0x0000000000330000-0x000000000033D000-memory.dmp	buer
behavioral1/memory/2388-6-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/1888-22-0x00000000003C0000-0x00000000003CF000-memory.dmp	buer

Deletes itself 1 IoCs

pid	Process
1888	gennt.exe

Executes dropped EXE 1 IoCs

pid	Process
1888	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
2388	ReviewPrint.exe
2388	ReviewPrint.exe

Enumerates connected drives 3 TTPs 23 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)	\??\X:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2860	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 1888	2388	ReviewPrint.exe	30
PID 2388 wrote to memory of 1888	2388	ReviewPrint.exe	30
PID 2388 wrote to memory of 1888	2388	ReviewPrint.exe	30
PID 2388 wrote to memory of 1888	2388	ReviewPrint.exe	30
PID 1888 wrote to memory of 2860	1888	gennt.exe	31
PID 1888 wrote to memory of 2860	1888	gennt.exe	31
PID 1888 wrote to memory of 2860	1888	gennt.exe	31
PID 1888 wrote to memory of 2860	1888	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\ReviewPrint.exe
"C:\Users\Admin\AppData\Local\Temp\ReviewPrint.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2388
- C:\ProgramData\ee1f742b7ab60297abc5\gennt.exe
  C:\ProgramData\ee1f742b7ab60297abc5\gennt.exe "C:\Users\Admin\AppData\Local\Temp\ReviewPrint.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Deletes itself
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:1888
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\ee1f742b7ab60297abc5}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

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

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Downloads

C:\ProgramData\ee1f742b7ab60297abc5\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
C:\ProgramData\ee1f742b7ab60297abc5\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
C:\ProgramData\ee1f742b7ab60297abc5\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
\ProgramData\ee1f742b7ab60297abc5\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
\ProgramData\ee1f742b7ab60297abc5\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
memory/1888-22-0x00000000003C0000-0x00000000003CF000-memory.dmp

Filesize
60KB

Download
memory/1888-46-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/1888-29-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/2388-20-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/2388-1-0x0000000000320000-0x0000000000321000-memory.dmp

Filesize
4KB

Download
memory/2388-9-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/2388-6-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/2388-3-0x0000000000330000-0x000000000033D000-memory.dmp

Filesize
52KB

Download
memory/2388-0-0x0000000000340000-0x000000000034F000-memory.dmp

Filesize
60KB

Download
memory/2860-34-0x00000000743D0000-0x000000007497B000-memory.dmp

Filesize
5.7MB

Download
memory/2860-35-0x00000000743D0000-0x000000007497B000-memory.dmp

Filesize
5.7MB

Download
memory/2860-36-0x0000000002310000-0x0000000002350000-memory.dmp

Filesize
256KB

Download
memory/2860-37-0x0000000002310000-0x0000000002350000-memory.dmp

Filesize
256KB

Download
memory/2860-38-0x00000000743D0000-0x000000007497B000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads