buer | 3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776

General

Target

3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe
Size

205KB
MD5

26244e477fce74ab4e36e26e600a96b0
SHA1

f2d51d793857e6d9829f24f711b37664cd737fa5
SHA256

3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776
SHA512

f6e0525a3295613137d9a102d9fcf6cf052df90e9676b3c9d260bc5353656ce31fb515bfd6a133ee9858b865a34207388f156510b41920c8e0913fc411b47d5d

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://rawcookies.ru/

https://westkingz.ru/

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\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\d4d24cc85f53f0a2a3cd\\gennt.exe\""	gennt.exe

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4352-131-0x0000000002130000-0x000000000213B000-memory.dmp	buer
behavioral2/memory/4352-132-0x0000000040000000-0x0000000040879000-memory.dmp	buer
behavioral2/memory/4168-137-0x0000000040000000-0x0000000040879000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
4168	gennt.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation	gennt.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)	\??\S:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3048	4352	WerFault.exe	80
3088	220	WerFault.exe	92

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4168	gennt.exe
4168	gennt.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4352 wrote to memory of 4168	4352	3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe	88
PID 4352 wrote to memory of 4168	4352	3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe	88
PID 4352 wrote to memory of 4168	4352	3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe	88
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 220	4168	gennt.exe	92
PID 4168 wrote to memory of 2000	4168	gennt.exe	95
PID 4168 wrote to memory of 2000	4168	gennt.exe	95
PID 4168 wrote to memory of 2000	4168	gennt.exe	95

C:\Users\Admin\AppData\Local\Temp\3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe
"C:\Users\Admin\AppData\Local\Temp\3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4352
- C:\ProgramData\d4d24cc85f53f0a2a3cd\gennt.exe
  C:\ProgramData\d4d24cc85f53f0a2a3cd\gennt.exe "C:\Users\Admin\AppData\Local\Temp\3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Checks computer location settings
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4168
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\d4d24cc85f53f0a2a3cd\gennt.exe
    3⤵
    PID:220
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 220 -s 272
      4⤵
      Program crash
      PID:3088
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\d4d24cc85f53f0a2a3cd}"
    3⤵
    PID:2000
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4352 -s 472
  2⤵
  - Program crash
  PID:3048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4352 -ip 4352
1⤵
PID:536

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 220 -ip 220
1⤵
PID:3732

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

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\d4d24cc85f53f0a2a3cd\gennt.exe

Filesize
205KB

MD5
26244e477fce74ab4e36e26e600a96b0

SHA1
f2d51d793857e6d9829f24f711b37664cd737fa5

SHA256
3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776

SHA512
f6e0525a3295613137d9a102d9fcf6cf052df90e9676b3c9d260bc5353656ce31fb515bfd6a133ee9858b865a34207388f156510b41920c8e0913fc411b47d5d

Download Submit
C:\ProgramData\d4d24cc85f53f0a2a3cd\gennt.exe

Filesize
205KB

MD5
26244e477fce74ab4e36e26e600a96b0

SHA1
f2d51d793857e6d9829f24f711b37664cd737fa5

SHA256
3c2382bdd0ace893cf833df5096a739330cd4f6cd1cc8e410634bdd166b5c776

SHA512
f6e0525a3295613137d9a102d9fcf6cf052df90e9676b3c9d260bc5353656ce31fb515bfd6a133ee9858b865a34207388f156510b41920c8e0913fc411b47d5d

Download Submit
memory/220-139-0x0000000001000000-0x0000000001879000-memory.dmp

Filesize
8.5MB

Download
memory/4168-136-0x00000000005BE000-0x00000000005C7000-memory.dmp

Filesize
36KB

Download
memory/4168-137-0x0000000040000000-0x0000000040879000-memory.dmp

Filesize
8.5MB

Download
memory/4352-130-0x000000000076E000-0x0000000000777000-memory.dmp

Filesize
36KB

Download
memory/4352-131-0x0000000002130000-0x000000000213B000-memory.dmp

Filesize
44KB

Download
memory/4352-132-0x0000000040000000-0x0000000040879000-memory.dmp

Filesize
8.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads