umbral | 29456c78a229429c66b4ce8997c9bb6593ad9b4e8928e094eb25caf4a7ee0e40

Resubmissions

25-11-2023 12:15

231125-pe82qsae24 10

25-11-2023 12:14

231125-pedwlaad98 10

25-11-2023 11:56

231125-n316csba21 10

Analysis

max time kernel
122s
max time network
125s
platform
windows7_x64
resource
win7-20231023-en
resource tags

arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
submitted
25-11-2023 12:14

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General

Target

Zul Free.exe
Size

230KB
MD5

a47cffac2602038b4cfc070f8a05243a
SHA1

4111453f445d10ef516e98a000cc84845658dabe
SHA256

29456c78a229429c66b4ce8997c9bb6593ad9b4e8928e094eb25caf4a7ee0e40
SHA512

e390d7c96e2b5b2cad52b80c276787cb37d7ca3a171868037c1f1ef9e58177baa9e07f8866e0a95560ee9e0af0a38ba218f9feeaf1f19d77915f9e5c08d4070d
SSDEEP

6144:1loZM+rIkd8g+EtXHkv/iD4tT1FzQEbqCzFQMpxbztjFK8e1mOvi:XoZtL+EP8tT1FzQEbqCzFQMpVpjy0

Score

10^/10

umbral stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/536-0-0x0000000000970000-0x00000000009B0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\perfmon.msc	mmc.exe

Modifies Internet Explorer settings 1 TTPs 3 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3618187007-3650799920-3290345941-1000\Software\Microsoft\Internet Explorer\Main	mmc.exe
Key created	\REGISTRY\USER\S-1-5-21-3618187007-3650799920-3290345941-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	mmc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3618187007-3650799920-3290345941-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	mmc.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2824	mmc.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

description	pid	Process
Token: SeDebugPrivilege	536	Zul Free.exe
Token: SeIncreaseQuotaPrivilege	2748	wmic.exe
Token: SeSecurityPrivilege	2748	wmic.exe
Token: SeTakeOwnershipPrivilege	2748	wmic.exe
Token: SeLoadDriverPrivilege	2748	wmic.exe
Token: SeSystemProfilePrivilege	2748	wmic.exe
Token: SeSystemtimePrivilege	2748	wmic.exe
Token: SeProfSingleProcessPrivilege	2748	wmic.exe
Token: SeIncBasePriorityPrivilege	2748	wmic.exe
Token: SeCreatePagefilePrivilege	2748	wmic.exe
Token: SeBackupPrivilege	2748	wmic.exe
Token: SeRestorePrivilege	2748	wmic.exe
Token: SeShutdownPrivilege	2748	wmic.exe
Token: SeDebugPrivilege	2748	wmic.exe
Token: SeSystemEnvironmentPrivilege	2748	wmic.exe
Token: SeRemoteShutdownPrivilege	2748	wmic.exe
Token: SeUndockPrivilege	2748	wmic.exe
Token: SeManageVolumePrivilege	2748	wmic.exe
Token: 33	2748	wmic.exe
Token: 34	2748	wmic.exe
Token: 35	2748	wmic.exe
Token: SeIncreaseQuotaPrivilege	2748	wmic.exe
Token: SeSecurityPrivilege	2748	wmic.exe
Token: SeTakeOwnershipPrivilege	2748	wmic.exe
Token: SeLoadDriverPrivilege	2748	wmic.exe
Token: SeSystemProfilePrivilege	2748	wmic.exe
Token: SeSystemtimePrivilege	2748	wmic.exe
Token: SeProfSingleProcessPrivilege	2748	wmic.exe
Token: SeIncBasePriorityPrivilege	2748	wmic.exe
Token: SeCreatePagefilePrivilege	2748	wmic.exe
Token: SeBackupPrivilege	2748	wmic.exe
Token: SeRestorePrivilege	2748	wmic.exe
Token: SeShutdownPrivilege	2748	wmic.exe
Token: SeDebugPrivilege	2748	wmic.exe
Token: SeSystemEnvironmentPrivilege	2748	wmic.exe
Token: SeRemoteShutdownPrivilege	2748	wmic.exe
Token: SeUndockPrivilege	2748	wmic.exe
Token: SeManageVolumePrivilege	2748	wmic.exe
Token: 33	2748	wmic.exe
Token: 34	2748	wmic.exe
Token: 35	2748	wmic.exe
Token: 33	2824	mmc.exe
Token: SeIncBasePriorityPrivilege	2824	mmc.exe
Token: 33	2824	mmc.exe
Token: SeIncBasePriorityPrivilege	2824	mmc.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe
2824	mmc.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 2988 wrote to memory of 2580	2988	wmplayer.exe	29
PID 536 wrote to memory of 2748	536	Zul Free.exe	30
PID 536 wrote to memory of 2748	536	Zul Free.exe	30
PID 536 wrote to memory of 2748	536	Zul Free.exe	30

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Zul Free.exe
"C:\Users\Admin\AppData\Local\Temp\Zul Free.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:536
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2748

C:\Program Files (x86)\Windows Media Player\wmplayer.exe
"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /prefetch:1
1⤵
- Suspicious use of WriteProcessMemory
PID:2988
- C:\Program Files (x86)\Windows Media Player\setup_wm.exe
  "C:\Program Files (x86)\Windows Media Player\setup_wm.exe" /RunOnce:"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /prefetch:1
  2⤵
  PID:2580

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2464

C:\Windows\system32\mmc.exe
"C:\Windows\system32\mmc.exe" "C:\Windows\system32\perfmon.msc" /s
1⤵
- Drops file in System32 directory
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:2824

C:\Windows\system32\wbem\WmiApSrv.exe
C:\Windows\system32\wbem\WmiApSrv.exe
1⤵
PID:2556

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp12284.WMC\allservices.xml

Filesize
546B

MD5
df03e65b8e082f24dab09c57bc9c6241

SHA1
6b0dacbf38744c9a381830e6a5dc4c71bd7cedbf

SHA256
155b9c588061c71832af329fafa5678835d9153b8fbb7592195ae953d0c455ba

SHA512
ef1cc8d27fbc5da5daab854c933d3914b84ee539d4d2f0126dc1a04a830c5599e39a923c80257653638b1b99b0073a7174cc164be5887181730883c752ba2f99

Download Submit
memory/536-0-0x0000000000970000-0x00000000009B0000-memory.dmp

Filesize
256KB

Download
memory/536-1-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/536-2-0x000000001B0C0000-0x000000001B140000-memory.dmp

Filesize
512KB

Download
memory/536-11-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-12-0x00000000020D0000-0x00000000020D1000-memory.dmp

Filesize
4KB

Download
memory/2824-31-0x000007FFFFF60000-0x000007FFFFF70000-memory.dmp

Filesize
64KB

Download
memory/2824-35-0x00000000020D0000-0x00000000020D1000-memory.dmp

Filesize
4KB

Download