50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ec

General

Target
50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe
Size 135KB
Sample241031-anzr4avcpg
SHA256 50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ec
MD5 c76e425bf6e47a855bb0b3d934669a60
SHA1 7d84e28046ab52e5cfdad8f7110e099b775e1a57
SHA512 a5fb2e6c649ec8dd94e9c375bf74ff9a71a2130fd62d96c05a19e9bf93e05715defed0b44f6fe80bafa91dd5a8a7d8ec8b2d228800f1b6dca28a1c403ea51aad
SSDEEP 1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOq:YfU/WF6QMauSuiWNi9eNOl0007NZIOq
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

defense_evasion discovery persistence upx

Malware Config

Signatures

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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe

Executes dropped EXE 1 IoCs

pid	Process
1128	wuauclt.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Window Update = "\"C:\\ProgramData\\Update\\wuauclt.exe\" /run"	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

UPX packed file 6 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2760-0-0x0000000000FA0000-0x0000000000FC8000-memory.dmp	upx
behavioral2/files/0x0009000000023c68-3.dat	upx
behavioral2/memory/1128-4-0x0000000000C30000-0x0000000000C58000-memory.dmp	upx
behavioral2/memory/2760-6-0x0000000000FA0000-0x0000000000FC8000-memory.dmp	upx
behavioral2/memory/1128-7-0x0000000000C30000-0x0000000000C58000-memory.dmp	upx
behavioral2/memory/2760-8-0x0000000000FA0000-0x0000000000FC8000-memory.dmp	upx

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wuauclt.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 1128	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	83
PID 2760 wrote to memory of 1128	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	83
PID 2760 wrote to memory of 1128	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	83
PID 2760 wrote to memory of 3436	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	102
PID 2760 wrote to memory of 3436	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	102
PID 2760 wrote to memory of 3436	2760	50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe	102

C:\Users\Admin\AppData\Local\Temp\50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe
"C:\Users\Admin\AppData\Local\Temp\50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2760
- C:\ProgramData\Update\wuauclt.exe
  "C:\ProgramData\Update\wuauclt.exe" /run
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:1128
- C:\windows\SysWOW64\cmd.exe
  "C:\windows\system32\cmd.exe" /c del /q "C:\Users\Admin\AppData\Local\Temp\50d436c25f28915a1eaddad426d8a3406d5497e95d18633adfcfc83f7cffa9ecN.exe" >> NUL
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3436

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Indicator Removal

1

T1070

File Deletion

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

wuauclt.exe

Path C:\ProgramData\Update\wuauclt.exe
Size 135KB
SHA256 17e90cad7dd3c58f82b337e3d701127a4e0ad6fd7c4dd6bf07ccd5f161ec30a2
MD5 8f15a3b08dc25a00c07c60a8c959e8d6
SHA1 b873452ce801dd0ae621f42c6a8f04b34510f096
SHA512 fb3a2b7d9c02fb3286828f9dcbbaabe6ef62d73e030885463bd85befebf452b710627ce32ad2eedd9475024bbb151c0b044750d31787b39b9bc4076af9b38b88
SSDEEP 1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOI:YfU/WF6QMauSuiWNi9eNOl0007NZIOI
MD5 SHA1 SHA512 SSDEEP

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memory/1128-4-0x0000000000C30000-0x0000000000C58000-memory.dmp

Download

memory/1128-7-0x0000000000C30000-0x0000000000C58000-memory.dmp

Download

memory/2760-0-0x0000000000FA0000-0x0000000000FC8000-memory.dmp

Download

memory/2760-6-0x0000000000FA0000-0x0000000000FC8000-memory.dmp

Download

memory/2760-8-0x0000000000FA0000-0x0000000000FC8000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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