buer | 1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937

General

Target

1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe
Size

172KB
MD5

98b738e1751444de2fbb696cb7a8dda5
SHA1

1ce99114d5957f451ccc3e50959ba1ecfcd3699a
SHA256

1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937
SHA512

0248e148d82e471506bbfd191717de41d8403dad499547ae7686d77833aa47b903fa2175947b08a5e0984b92a99fc81c47b2234fc3d112ec1198e6bdf64b4879
SSDEEP

1536:4gtwp3Ct5Bsh9atD6i4+WVEdXT9HNhmBhFOH3aaaaaaaaaaaaaaaaaaaaaaaaadb:HwtIx+61cAIp9BAVf2S

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://165.232.118.210/

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\\a0a8c4b4f17ccb9e6b8d\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/752-1-0x00000000021A0000-0x00000000021AD000-memory.dmp	buer
behavioral2/memory/752-0-0x00000000021B0000-0x00000000021BF000-memory.dmp	buer
behavioral2/memory/752-5-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/2260-12-0x00000000005C0000-0x00000000005CF000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
2260	gennt.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)	\??\T:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\E:	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)	\??\S:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3412	powershell.exe
3412	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3412	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 752 wrote to memory of 2260	752	1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe	90
PID 752 wrote to memory of 2260	752	1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe	90
PID 752 wrote to memory of 2260	752	1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe	90
PID 2260 wrote to memory of 3412	2260	gennt.exe	91
PID 2260 wrote to memory of 3412	2260	gennt.exe	91
PID 2260 wrote to memory of 3412	2260	gennt.exe	91

C:\Users\Admin\AppData\Local\Temp\1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe
"C:\Users\Admin\AppData\Local\Temp\1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:752
- C:\ProgramData\a0a8c4b4f17ccb9e6b8d\gennt.exe
  C:\ProgramData\a0a8c4b4f17ccb9e6b8d\gennt.exe "C:\Users\Admin\AppData\Local\Temp\1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937_JC.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\a0a8c4b4f17ccb9e6b8d}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3412

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\a0a8c4b4f17ccb9e6b8d\gennt.exe

Filesize
172KB

MD5
98b738e1751444de2fbb696cb7a8dda5

SHA1
1ce99114d5957f451ccc3e50959ba1ecfcd3699a

SHA256
1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937

SHA512
0248e148d82e471506bbfd191717de41d8403dad499547ae7686d77833aa47b903fa2175947b08a5e0984b92a99fc81c47b2234fc3d112ec1198e6bdf64b4879

Download Submit
C:\ProgramData\a0a8c4b4f17ccb9e6b8d\gennt.exe

Filesize
172KB

MD5
98b738e1751444de2fbb696cb7a8dda5

SHA1
1ce99114d5957f451ccc3e50959ba1ecfcd3699a

SHA256
1ba48c78b0826e7cd6a9d2a927e1575c561d23782a9c094cd3a9e6096297e937

SHA512
0248e148d82e471506bbfd191717de41d8403dad499547ae7686d77833aa47b903fa2175947b08a5e0984b92a99fc81c47b2234fc3d112ec1198e6bdf64b4879

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bonvymj4.rxq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/752-0-0x00000000021B0000-0x00000000021BF000-memory.dmp

Filesize
60KB

Download
memory/752-5-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/752-1-0x00000000021A0000-0x00000000021AD000-memory.dmp

Filesize
52KB

Download
memory/2260-12-0x00000000005C0000-0x00000000005CF000-memory.dmp

Filesize
60KB

Download
memory/3412-35-0x0000000005BF0000-0x0000000005C0E000-memory.dmp

Filesize
120KB

Download
memory/3412-48-0x0000000006180000-0x000000000619E000-memory.dmp

Filesize
120KB

Download
memory/3412-22-0x0000000004E00000-0x0000000005428000-memory.dmp

Filesize
6.2MB

Download
memory/3412-23-0x0000000004B80000-0x0000000004BA2000-memory.dmp

Filesize
136KB

Download
memory/3412-24-0x0000000005430000-0x0000000005496000-memory.dmp

Filesize
408KB

Download
memory/3412-25-0x0000000005510000-0x0000000005576000-memory.dmp

Filesize
408KB

Download
memory/3412-20-0x00000000025C0000-0x00000000025D0000-memory.dmp

Filesize
64KB

Download
memory/3412-19-0x0000000074B30000-0x00000000752E0000-memory.dmp

Filesize
7.7MB

Download
memory/3412-36-0x00000000025C0000-0x00000000025D0000-memory.dmp

Filesize
64KB

Download
memory/3412-37-0x00000000061A0000-0x00000000061D2000-memory.dmp

Filesize
200KB

Download
memory/3412-38-0x00000000709D0000-0x0000000070A1C000-memory.dmp

Filesize
304KB

Download
memory/3412-21-0x0000000002540000-0x0000000002576000-memory.dmp

Filesize
216KB

Download
memory/3412-49-0x0000000007530000-0x0000000007BAA000-memory.dmp

Filesize
6.5MB

Download
memory/3412-50-0x0000000006EE0000-0x0000000006EFA000-memory.dmp

Filesize
104KB

Download
memory/3412-51-0x0000000006F60000-0x0000000006F6A000-memory.dmp

Filesize
40KB

Download
memory/3412-52-0x0000000007160000-0x00000000071F6000-memory.dmp

Filesize
600KB

Download
memory/3412-53-0x0000000074B30000-0x00000000752E0000-memory.dmp

Filesize
7.7MB

Download
memory/3412-54-0x0000000007130000-0x000000000713E000-memory.dmp

Filesize
56KB

Download
memory/3412-55-0x0000000007240000-0x000000000725A000-memory.dmp

Filesize
104KB

Download
memory/3412-56-0x0000000007220000-0x0000000007228000-memory.dmp

Filesize
32KB

Download
memory/3412-57-0x00000000025C0000-0x00000000025D0000-memory.dmp

Filesize
64KB

Download
memory/3412-60-0x0000000074B30000-0x00000000752E0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads