floxif | 9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732

General

Target

9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
Size

749KB
MD5

e68369e17367e41717dbb16caddc9d30
SHA1

f2dc50d804f963797d65eb9b06a69d38fb7fd358
SHA256

9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732
SHA512

06ebcaf9ec06f95bfb76bcd685ae752c6c27a516c9b8a9c1d6752d6d46fa402866a988162a3e4163a9faed64872afbe933e6f8fcd79d551452f3d63a4bdf5fe0
SSDEEP

12288:eKQbsJFJLEBMmOI7T7/BH0Cxf7377ZMhp2Wrz+91Gq3Tq0WN699y+8SAKBjvrEHM:eK+SL3mOIj/BHlf77NMhp7z01L3Tq5Ni

Score

10^/10

floxif backdoor discovery persistence privilege_escalation trojan upx

Malware Config

Signatures

Floxif family
floxif
Floxif, Floodfix
Floxif aka FloodFix is a file-changing trojan and backdoor written in C++.
backdoor trojan floxif

Detects Floxif payload 1 IoCs

backdoor

resource	yara_rule
behavioral1/files/0x0007000000012116-1.dat	floxif

Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
persistence privilege_escalation

AppInit DLLs
T1546.010

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral1/files/0x0007000000012116-1.dat	acprotect

Loads dropped DLL 3 IoCs

pid	Process
2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
2560	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
2560	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

Enumerates connected drives 3 TTPs 1 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)	\??\e:	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x0007000000012116-1.dat	upx
behavioral1/memory/2440-3-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2560-15-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2560-23-0x0000000010000000-0x0000000010030000-memory.dmp	upx
behavioral1/memory/2440-29-0x0000000010000000-0x0000000010030000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\System\symsrv.dll	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
File created	\??\c:\program files\common files\system\symsrv.dll.000	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

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 2 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	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
Token: SeDebugPrivilege	2560	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 2560	2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe	30
PID 2440 wrote to memory of 2560	2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe	30
PID 2440 wrote to memory of 2560	2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe	30
PID 2440 wrote to memory of 2560	2440	9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe	30

C:\Users\Admin\AppData\Local\Temp\9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
"C:\Users\Admin\AppData\Local\Temp\9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe"
1⤵
- Loads dropped DLL
- Enumerates connected drives
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2440
- C:\Users\Admin\AppData\Local\Temp\9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe
  "C:\Users\Admin\AppData\Local\Temp\9b831491d41f8a6e59ed10ce7e72caf62f40eecd7d98db1b7fa1c3f9ef5d6732N.exe" -sfxwaitall:0 "78RePack.exe"
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2560

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

Privilege Escalation

Event Triggered Execution

1

T1546

AppInit DLLs

1

T1546.010

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\78RePack.exe

Filesize
570KB

MD5
e0e3ead1079332c4957a4c027f26d12f

SHA1
23aec6b7a5343124e92a0c10a7018ab294a00812

SHA256
7a180e24bac1817de10d42b63124c730a0a2957ca313d9ce454a1dff0d1eb1e6

SHA512
2a002302561a32f8f62aa7480c3caa12c41978d81842f119a58ca1d9b94f72792a8d4d46aa9f3a0308d1e87609f6fab7b7215ee24c3ebc83946007fbe3e918ef

Download Submit
\??\c:\users\admin\appdata\local\temp\7zipsfx.000\WLImagex.exe

Filesize
133KB

MD5
df116571bfff53525bf924243b5ea251

SHA1
c44fad3359d73eb035da8b956605d3f1f0c85d6c

SHA256
0fca1b2843349c9bff5b5e8770f7702bfa2526a955cd62c2453572037702a85b

SHA512
201b96339427f2c319edbfffc74e93bd5f3322d86542c695097ee0a567c4891a90b4628c446d3cfa4891c25c928cdec2a47c90debfca057cddcb614ad6614371

Download Submit
\??\c:\users\admin\appdata\local\temp\7zipsfx.000\libwim-15.dll

Filesize
774KB

MD5
efa35e962eb00a0b662f6536b00bf5e6

SHA1
2916212f74e538395a542ba5728574508710f18f

SHA256
f19bf1258e86f9b63d0b2c36eb136894c531682eb7dcc784e8b8e2a3d8bd3c70

SHA512
0bf6d0e1cec68b32f4dc1b593c7dd5aba60c47666952e4bf5131c93bf828eb89a70bbe7f84d48baf3f7571ac827e511f87de176e0dcbf1140c641b705da06f22

Download Submit
\Program Files\Common Files\System\symsrv.dll

Filesize
67KB

MD5
7574cf2c64f35161ab1292e2f532aabf

SHA1
14ba3fa927a06224dfe587014299e834def4644f

SHA256
de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085

SHA512
4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

Download Submit
\Users\Admin\AppData\Local\Temp\7ZipSfx.000\78RePack.exe.tmp

Filesize
646KB

MD5
2a866db5007fca71cb0843298d4dbd99

SHA1
0b6929e3c4e40aad3ad0a3ee5aeb44097692dd12

SHA256
0ecae9daeee8e6fae0f5f93d020126c2379d46b015b82d87f990276650e7607a

SHA512
7754850c0f1de104f8c21ddd9e17f3288fa82d4e6e1b0dcf25b0881295b49f3b61fe6117872718800fbc5ab02a036ca90c1c36bb6aed33ea2798313ed0f98500

Download Submit
memory/2440-3-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2440-5-0x000000000040A000-0x000000000040D000-memory.dmp

Filesize
12KB

Download
memory/2440-29-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2560-15-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2560-16-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/2560-23-0x0000000010000000-0x0000000010030000-memory.dmp

Filesize
192KB

Download
memory/2560-24-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

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